The probability of an event and the
probability of its complement always sum to:
A.any value between 0 and 1
B.1.0
C.0
D.any positive value
Question 3 of 25 0.0/ 1.0 Points
If A and B are mutually exclusive
events with P(A) = 0.70, then P(B):
A.can be any value between 0 and 0.70
B.cannot be determined with the
information given
C.can be any value between 0 and 1
D.cannot be larger than 0.30
Part 3 of 9 - 3.0/ 3.0 Points
Question 4 of 25 1.0/ 1.0 Points
A die is rolled 360 times. Find the
standard deviation for the number of 3s that will be rolled.
A.60
B.50
C.7.1
D.5.9
Question 5 of 25 1.0/ 1.0 Points
If a student randomly guesses at 20
multiple-choice questions, find the probability that the student gets exactly
four correct. Each question has four possible choices.
A.0.19
B.0.17
C.0.08
D.0.23
Find the variance of the following
probability distribution.
X P(X)
1 0.10
2 0.35
3 0.10
4 0.15
5 0.30
A.1.44
B.2.06
C.1.76
D.1.2
Question 7 of 25 1.0/ 1.0 Points
The continuous distribution
characterized by a symmetric, bell-shaped curve is the:
A.Poisson distribution
B.binomial distribution
C.exponential distribution
D.normal distribution
Question 8 of 25 1.0/ 1.0 Points
The average height of flowering cherry
trees in a nursery is 11 feet. If the heights are normally distributed with a
standard deviation of 1.6, find the probability that a randomly selected cherry
tree in this nursery is less than 13 feet tall.
A. 0.67
B.0.89
C.0.95
D.0.11
Question 9 of 25 1.0/ 1.0 Points
The standard deviation of a probability
distribution must be:
A.a negative number
B.a number between 0 and 1
C.a nonnegative number
D.less than the value of the mean
Question 10 of 25 1.0/ 1.0 Points
In a normal distribution, changing the
standard deviation:
A.splits the distribution to two curves
B.shifts the curve left or right
C.makes the curve more or less spread
out
D.makes the curve more robust
Question 11 of 25 1.0/ 1.0 Points
If the value of the standard normal
random variable Z is positive, then the original score is where in relationship
to the mean?
A.one standard deviation higher than
the mean
B.equal to the mean
C.to the left of the mean
D.to the right of the mean
Question 12 of 25 1.0/ 1.0 Points
The standard normal distribution has a
mean of ___ and standard deviation of ___, respectively.
A.1 and 1
B.1 and 0
C.0 and 1
D.0 and 0
Part 5 of 9 - 1.0/ 1.0 Points
Question 13 of 25 1.0/ 1.0 Points
Accepted characters: numbers, decimal
point markers (period or comma), sign indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be used as the decimal
point marker.
Complex numbers should be in the form
(a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas
{1+i} is not. {0+9i} is valid whereas {9i} is not.
The following data represent the number
of children in a sample of 10 families from Chicago: 4, 2, 1, 1, 5, 3, 0, 1, 0,
and 2.
Compute the median number of children.
Place your answer, rounded to two decimal places, in the blank. For example,
3.45 would be a legitimate entry. 1.5
Part 6 of 9 - 0.0/ 2.0 Points
Question 14 of 25 0.0/ 1.0 Points
Accepted characters: numbers, decimal
point markers (period or comma), sign indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be used as the decimal
point marker.
Complex numbers should be in the form
(a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas
{1+i} is not. {0+9i} is valid whereas {9i} is not.
In February 2002 the Argentine peso
lost 70% of its value compared to the United States dollar. This devaluation
drastically raised the price of imported products. According to a survey
conducted by AC Nielsen in April 2002, 68% of the consumers in Argentina were
buying fewer products than before the devaluation, 24% were buying the same
number of products, and 8% were buying more products. Furthermore, in a trend
toward purchasing less-expensive brands, 88% indicated that they had changed
the brands they purchased. Suppose the following complete set of results were
reported. Use the following data to answer this question.
Number of Products Purchased
Brands Purchased Fewer Same More Total
Same 10 14 24 48
Changed 262 82 8 352
Total 272 96 32 400
Given that a consumer changed brands,
what then is the probability that the consumer purchased fewer products than
before? Place your answer, rounded to 4 decimal places, in the blank. 0.1165
Question 15 of 25 0.0/ 1.0 Points
Accepted characters: numbers, decimal
point markers (period or comma), sign indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be used as the decimal
point marker.
Complex numbers should be in the form
(a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas
{1+i} is not. {0+9i} is valid whereas {9i} is not.
The following data were obtained from a
survey of college students. The variable X represents the number of
non-assigned books read during the past six months.
x 0 1 2 3 4 5 6
P (X=x) 0.55 0.15 0.10 0.10 0.04 0.03
0.03
What is the standard deviation of X?
Place your answer, rounded to two decimal places in the blank. For example,
4.56 would be a legitimate entry. 2.62
Part 7 of 9 - 1.0/ 2.0 Points
Question 16 of 25 1.0/ 1.0 Points
Accepted characters: numbers, decimal
point markers (period or comma), sign indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be used as the decimal
point marker.
Complex numbers should be in the form
(a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas
{1+i} is not. {0+9i} is valid whereas {9i} is not.
A jar contains four white marbles, five
red marbles, and six black marbles. If a marble was selected at random, find
the probability that it is white or black. Place your answer, rounded to 2
decimal places in the blank. For example 0.23 would be a legitimate entry. 0.67
Complex numbers should be in the form
(a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas
{1+i} is not. {0+9i} is valid whereas {9i} is not.
An urn contains 12 balls identical in
every respect except their color. There are 3 red balls, 7 green balls, and 2
blue balls. You draw two balls from the urn, but replace the first ball before
drawing the second. Find the probability that the first ball drawn is red and
the second ball drawn is green. Place your answer, rounded to 4 decimal places,
in the blank. For example, 0.4567 would be a legitimate entry. 0.1591
Part 8 of 9 - 6.0/ 6.0 Points
Question 18 of 25 1.0/ 1.0 Points
Accepted characters: numbers, decimal
point markers (period or comma), sign indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be used as the decimal
point marker.
Complex numbers should be in the form
(a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas
{1+i} is not. {0+9i} is valid whereas {9i} is not.
Suppose that the average weekly
earnings for employees in general automotive repair shops is $450, and that the
standard deviation for the weekly earnings for such employees is $50. A sample
of 100 such employees is selected at random.
Find the mean of the sampling
distribution of the means of average weekly earnings for samples of size 100.
Place your answer in the blank. Do not include a dollar sign. For example, 123
would be a legitimate entry. 450
Question 19 of 25 1.0/ 1.0 Points
Accepted characters: numbers, decimal
point markers (period or comma), sign indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be used as the decimal
point marker.
Complex numbers should be in the form
(a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas
{1+i} is not. {0+9i} is valid whereas {9i} is not.
A Wendy’s fast-food restaurant sells
hamburgers and chicken sandwiches. On a typical weekday, the demand for
hamburgers is normally distributed with a mean of 450 and standard deviation of
80 and the demand for chicken sandwiches is normally distributed with a mean of
120 and standard deviation of 30.
How many hamburgers must the restaurant
stock to be 99% sure of not running out on a given day? Place you answer,
rounded to the nearest whole number in the blank. For example, 345 would be a
legitimate entry. 636
Question 20 of 25 1.0/ 1.0 Points
Accepted characters: numbers, decimal
point markers (period or comma), sign indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be used as the decimal
point marker.
Complex numbers should be in the form
(a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas
{1+i} is not. {0+9i} is valid whereas {9i} is not.
Scores on a mathematics examination
appear to follow a normal distribution with mean of 65 and standard deviation
of 15. The instructor wishes to give a grade of “C” to students scoring between
the 60th and 70th percentiles on the exam.
What score represents the 60th
percentile score on the mathematics exam? Place your answer in the blank,
rounded to a whole number. For example, 62 would be a legitimate entry. 69
Question 21 of 25 1.0/ 1.0 Points
Accepted characters: numbers, decimal
point markers (period or comma), sign indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be used as the decimal
point marker.
Complex numbers should be in the form
(a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas
{1+i} is not. {0+9i} is valid whereas {9i} is not.
Suppose that the average weekly
earnings for employees in general automotive repair shops is $450, and that the
standard deviation for the weekly earnings for such employees is $50. A sample
of 100 such employees is selected at random.
Find probability that the mean of the
sample is less than $445. Place your answer, rounded to 4 decimal places, in
the blank. For example, 0.2345 would be a legitimate entry. 0.1587
Question 22 of 25 1.0/ 1.0 Points
Accepted characters: numbers, decimal
point markers (period or comma), sign indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be used as the decimal
point marker.
Complex numbers should be in the form
(a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas
{1+i} is not. {0+9i} is valid whereas {9i} is not.
Suppose that the average weekly
earnings for employees in general automotive repair shops is $450, and that the
standard deviation for the weekly earnings for such employees is $50. A sample
of 100 such employees is selected at random.
Find the probability that the mean of
the sample is between $445 and $455. Place your answer, rounded to 4 decimal
places, in the blank. For example, 0.2345 would be a legitimate entry. 0.6827
Question 23 of 25 1.0/ 1.0 Points
Accepted characters: numbers, decimal
point markers (period or comma), sign indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be used as the decimal
point marker.
Complex numbers should be in the form
(a + bi) where "a" and "b" need to have explicitly stated
values.
For example: {1+1i} is valid whereas
{1+i} is not. {0+9i} is valid whereas {9i} is not.
A set of final exam scores in an
organic chemistry course was found to be normally distributed, with a mean of
73 and a standard deviation of 8.
What is the probability of getting a
score higher than 71 on this exam? Place your answer, rounded to 4 decimal
places in the blank. For example, 0.3456 would be a legitimate entry. 0.5987
Part 9 of 9 - 2.0/ 2.0 Points
Question 24 of 25 1.0/ 1.0 Points
A random variable X is standardized
when each value of X has the mean of X subtracted from it, and the difference
is divided by the standard deviation of X.
True
False
Question 25 of 25 1.0/ 1.0 Points
Using the standard normal curve, the Z-
score representing the 5th percentile is 1.645.
True
False
Set 2
SET 3
uestion 1 of 25
The mode is best described as the
A.same as the average
B.middle observation
C.most frequently occurring value
D.50th percentile
Part 2 of 9 -
Question 2 of 25
A jar contains four white marbles, five red marbles, and six black marbles. If
a marble is selected at random, find the
probability that it is white or black .
A.2/15
B.2/3
C.1/5
D.2/5
Question 3 of 25
The formal way to revise probabilities based on new information is to use:
A.common sense probabilities
B.unilateral probabilities
C.complementary probabilities
D.conditional probabilities
Part 3 of 9 -
Question 4 of 25
If a gambler rolls two dice and gets a sum of 10, he wins $10, and if he gets a
sum of
three, he wins $20. The cost to play the game is $5. What is the expectation of
this
game?
A.$3.06
B.-$2.78
C.-$3.06
D.$2.78
Question 5 of 25
Suppose that 50 identical batteries are being tested. After 8 hours of
continuous use, assume that a given battery is still operating with a
probability of 0.70 and has failed with a probability of 0.30.
What is the probability that between 25 and 30 batteries (inclusive) will last
at least 8 hours?
A.0.7792
B.0.1186
C.0.0839
D.0.9169
Question 6 of 25
A drug is reported to benefit 40% of the patients who take it. If 6 patients
take the drug, what is the probability that 4 or more patients will benefit?
A.0.667
B.0.179
C.0.138
D.0.862
Part 4 of 9 -
Question 7 of 25
Find the probability, P(Z < 0.17), using the standard normal distribution.
A..8300
B..4325
C..5675
D..0675
Question 8 of 25
Given that Z is a standard normal variable, the value z for which P(Z < z) =
0.2580 is
A.-0.65
B.-0.70
C.0.242
D.0.758
Question 9 of 25
The average height of flowering cherry trees in a nursery is 11 feet. If the
heights are normally distributed with a standard deviation of 1.6, find the
probability that a randomly selected cherry tree in this nursery is less than
13 feet tall.
A. 0.67
B.0.89
C.0.95
D.0.11
Question 10 of 25
If Z is a standard normal random variable, the area between z = 0.0 and z =1.30
is 0.4032, while the area between z = 0.0 and z = 1.50 is 0.4332. What is the
area between z = -1.30 and z = 1.50?
A.0.8364
B.0.0668
C.0.0968
D.0.0300
Question 11 of 25
Given that the random variable X is normally distributed with a mean of 80 and
a standard deviation of 10, P(85 < X <
90) is
A.0.5328
B.0.3413
C.0.1498
D.0.1915
Question 12 of 25
In a normal distribution, changing the standard deviation:
A.makes the curve more robust
B.shifts the curve left or right
C.makes the curve more or less spread out
D.splits the distribution to two curves
Part 5 of 9 -
Question 13 of 25
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be
used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
Suppose that an analysis of a set of test scores reveals that:.
Compute the interquartile range. Place your answer, rounded to 1 decimal place,
in the blank. For example, 32.1 would be a legitimate entry.
Part 6 of 9 -
Question 14 of 25
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be
used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
The following data were obtained from a survey of college students. The
variable X represents the number
of non-assigned books read during the past six months.
x
P (X=x)
0
0.55
1
0.15
2
0.10
3
0.10
4
0.04
5
0.03
6
0.03
What is the standard deviation of X? Place your answer, rounded to two decimal
places in the blank. For example, 4.56 would be a legitimate entry.
Question 15 of 25
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be
used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
A DVD rental business determines that customers will rent X number of DVDs
according to the following distribution:
Number of DVDs rented X
Probability P(X)
1
2
3
4
5
0.15 0.25 0.3 0.25 0.05
What is the mean number of DVDs that customers rent? Round your answer to one
decimal place as necessary. For
example, 4.5 would be a legitimate entry.
Answer:
Part 7 of 9 -
Question 16 of 25
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be
used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
Mothers Against Drunk Driving (MADD) is a very visible group whose main focus
is to educate the public
about the harm caused by drunk drivers. A study was recently done that
emphasized the problem we all
face with drinking and driving. Five hundred accidents that occurred on a
Saturday night were
analyzed. Two items noted were the number of vehicles involved and whether
alcohol played a role in the
accident. The numbers are shown below:
Number of Vehicles Involved
Did alcohol play a role?
Yes
No
1
60
40
100
2
110
215
325
3
30
45
75
200
300
Given that alcohol was not involved, what proportion of the accidents involved
a single vehicle? Place your
answer, rounded to 2 decimal places, in the blank. For example, 0.23 is a
legitimate
answer.
Question 17 of 25
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be
used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
Mothers Against Drunk Driving (MADD) is a very visible group whose main focus
is to educate the public
about the harm caused by drunk drivers. A study was recently done that
emphasized the problem we all
face with drinking and driving. Five hundred accidents that occurred on a
Saturday night were analyzed.
Two items noted were the number of vehicles involved and whether alcohol played
a role in the accident.
The numbers are shown below:
Number of Vehicles Involved
Did alcohol play a role?
1
2
3
200
Yes
60
110
30
300
No
40
215
45
100
325
75
What proportion of accidents involved alcohol or a single vehicle?
Place your answer, rounded to 2 decimal places, in the blank. For example, 0.23
is a legitimate entry.
Part 8 of 9 -
Question 18 of 25
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be
used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
Mrs. Smith's reading class can read a mean of 175 words per minute with a
standard deviation of 20 words per minute. The top 3% of the class is to
receive a special award.
Assuming that the distribution of words read per minute are normally
distributed, what is the minimum number of words per minute a student would
have to read in order to get the award? Place your answer, rounded to the
nearest whole number, in the When entering your answer do not use any labels or
blank.
symbols. Simply provide the numerical value. For example, 123 would be a
legitimate entry.
Question 19 of 25
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be
used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
A popular retail store knows that the purchase amounts by its customers is a
random variable that follows a normal
distribution with a mean of $30 and a standard deviation of $9.
What is the probability that a randomly selected customer will spend less than
$15 at this store? Place your answer,
rounded to 4 decimal places, in the blank. For example, 0.3456 would be a
legitimate entry.
Question 20 of 25
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be
used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
Scores on a mathematics examination appear to follow a normal distribution with
mean of 65 and standard deviation of 15. The instructor wishes to give a grade
of “C” to students scoring between the 60th and 70th percentiles on the exam.
What score represents the 70th percentile score on the mathematics exam? Place
your answer in the blank, rounded to a whole number. For example, 62 would be a
legitimate entry.
Question 21 of 25
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be
used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
The average hourly wage of workers at a fast food restaurant is $6.50/hr with a
standard deviation of $0.45. Assume
that the distribution is normally distributed. If a worker at this fast food
restaurant is selected at random, what is the
probability that the worker earns more than $6.75? Place your answer, rounded
to 4 decimal places, in the blank. For
example, 0.1776 would be a legitimate entry.
Question 22 of 25
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be
used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
The length of time to complete a door assembly on an automobile factory
assembly line is
normally distributed with mean 6.7 minutes and standard deviation 2.2 minutes.
For a
door selected at random, what is the probability the assembly line time will be
between 5
and 10 minutes? Place your answer, rounded to 4 decimal places, in the blank.
For
example, 0.1776 would be a legitimate answer.
Question 23 of 25
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as
thousands separator, 5 000), "E" or "e" (used in scientific
notation). NOTE: For scientific notation, a period MUST be
used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
Suppose that the average weekly earnings for employees in general automotive
repair shops is $450, and that the
standard deviation for the weekly earnings for such employees is $50. A sample
of 100 such employees is selected at random.
Find the probability that the mean of the sample is between $445 and $455.
Place your answer, rounded to 4 decimal
places, in the blank. For example, 0.2345 would be a legitimate entry.
Part 9 of 9 -
Question 24 of 25
Using the standard normal curve, the Z- score representing the 10th percentile
is 1.28.
True
False
Question 25 of 25
If Z is a standard normal variable, then P(Z > 1.50) = 0.9332
True
False
SET 4
Part
1 of 9 -
Question 1 of 25 1.0 Points
The mode is best described as the
A.same as the average
B.middle observation
C.most frequently occurring value
D.50th percentile
Reset Selection
Part 2 of 9 -
Question 2 of 25 1.0 Points
The table below shows the number of TVs and the number of Blu-Ray
players that residents in an apartment building have according to the type of
apartment that they live in.
1-bedroom 2-bedroom studio
TV 8 6 4
Blu-Ray3 1 2
What is the probability of randomly selecting an apartment which
has 1 bedroom or a Blu-Ray player?
A.0.273
B.0.125
C.0.708
D.0.583
Reset Selection
Question 3 of 25 1.0 Points
A jar contains four white marbles, five red marbles, and six black
marbles. If a marble is selected at random, find the probability that it is
white or black .
A.2/15
B.2/3
C.1/5
D.2/5
Reset Selection
Part 3 of 9 -
Question 4 of 25 1.0 Points
The following data were obtained from a survey of college
students. The variable X represents the number of non-assigned books read
during the past six months.
x 0 1 2 3 4 5
P (X=x)0.20 0.25 0.20 0.15 0.10 0.10
Find P( X 3)
A.0.15
B.0.85
C.0.80
D.0.20
Question 5 of 25 1.0 Points
A pet supplier has a stock of parakeets of which 10% are blue
parakeets. A pet store orders 3 parakeets from this supplier. If the supplier
selects the parakeets at random, what is the chance that the pet store gets
exactly one blue parakeet?
A.0.081
B.0.243
C.0.027
D.0.003
Reset Selection
Question 6 of 25 1.0 Points
Suppose that 50 identical batteries are being tested. After 8
hours of continuous use, assume that a given battery is still operating with a
probability of 0.70 and has failed with a probability of 0.30.
What is the probability that between 25 and 30 batteries
(inclusive) will last at least 8 hours?
A.0.9169
B.0.1186
C.0.7792
D.0.0839
Reset Selection
Part 4 of 9 -
Question 7 of 25 1.0 Points
In a normal distribution, changing the standard deviation:
A.makes the curve more or less spread out
B.splits the distribution to two curves
C.makes the curve more robust
D.shifts the curve left or right
Reset Selection
Question 8 of 25 1.0 Points
The theorem that states that the sampling distribution of the sample
mean is approximately normal when the sample size n is reasonably large is
known as the:
A.simple random sample theorem
B.central limit theorem
C.central tendency theorem
D.point estimate theorem
Reset Selection
Question 9 of 25 1.0 Points
The normal distribution is:
A.a binomial distribution with only one parameter
B.the single most important distribution in statistics
C.a discrete distribution
D.a density function of a discrete random variable
Reset Selection
Question 10 of 25 1.0 Points
The standard deviation of is usually called the
THIS LINE ABOVE IS INCOMPLETE, MY ANS IS BASED ON A GUESS
A.standard error of the sample
B.standard error of the population
C.standard error of the mean
D.randomized standard error
Reset Selection
Question 11 of 25 1.0 Points
The continuous distribution characterized by a symmetric,
bell-shaped curve is the:
A.binomial distribution
B.Poisson distribution
C.exponential distribution
D.normal distribution
Reset Selection
Question 12 of 25 1.0 Points
The mean of a probability distribution is a:
A. measure of variability of the distribution
B. measure of central location
C. measure of relative likelihood
D. measure of skewness of the distribution
Reset Selection
Part 5 of 9 -
Question 13 of 25 1.0 Points
Accepted characters: numbers, decimal point markers (period or
comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000),
"E" or "e" (used in scientific notation). NOTE: For
scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a"
and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid
whereas {9i} is not.
A sample of 150 students at a State University was taken after the
final business statistics exam to ask them whether they went partying the
weekend before the final or spent the weekend studying, and whether they did
well or poorly on the final. The following table contains the result.
Did Well in Exam Did Poorly in Exam
Studying for Exam 60 15
Went Partying 22 53
Of those in the sample who went partying the weekend before the
final exam, what percentage of them did well in the exam? Place your answer in
the blank, rounded to 2 decimal places. Do not use a percentage sign (%). For
example, 44.44 would be a legitmate answer.
Part 6 of 9 -
Question 14 of 25 1.0 Points
Accepted characters: numbers, decimal point markers (period or
comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000),
"E" or "e" (used in scientific notation). NOTE: For
scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a"
and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid
whereas {9i} is not.
It has been observed that electrical connectors manufactured by
Jolt Electrical Supply Company last an average of 18.2 months and follow a
normal distribution with a standard deviation of 1.7 months. Jolt agrees to
replace any connector that fails within 19 months. Out of 500 connectors sold,
how many does Jolt expect to replace, on average? Place your answer, rounded to
the nearest whole number, in the blank. For example, 123 would be a legitimate
answer. _____
Question 15 of 25 1.0 Points
Accepted characters: numbers, decimal point markers (period or
comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000),
"E" or "e" (used in scientific notation). NOTE: For
scientific notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a"
and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid
whereas {9i} is not.
Ann is applying for a bank loan to open a pizza franchise. She
must first complete a written application and then, if the written application
is approved, be interviewed by bank officers. If an applicant’s written
application is not approved the applicant is not granted an interview with the
bank officers. Past records for this bank show that the probability of an
applicant having his or her written application approved is 0.63. Records also
indicate that the interviewing committee of bank officers approves 85% of the
individuals they interview. Find the probability that Ann’s loan request is
approved. Place your answer, rounded to 2 decimal places, in the blank. For
example, 0.76 would be a legitimate entry. ___
Question 16 of 25
____________
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g.,
as thousands separator, 5 000), "E" or "e" (used in
scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
An ice cream vendor sells three flavors: chocolate, strawberry, and vanilla.
Forty five percent of the sales
are chocolate, while 30% are strawberry, with the rest vanilla flavored. Sales
are by the cone or the cup. The
percentages of cones sales for chocolate, strawberry, and vanilla, are 75%,
60%, and 40%, respectively. For
a randomly selected sale, define the following events:
1 = chocolate chosen
2 = strawberry chosen
3= vanilla chosen
= ice cream on a cone
= ice cream in a cup
Find the probability that the ice cream was vanilla flavor, given that it was
sold on a cone. Place
your answer, rounded to 4 decimal places, in the blank. For exampe, 0.3456
would be a legitimate entry.
______________
Part 7 of 9 Question 17 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g.,
as thousands separator, 5 000), "E" or "e" (used in
scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
Suppose that a marketing firm sends questionnaires to two different companies.
Based on historical
evidence, the marketing research firm believes that each company, independently
of the other, will return
the questionnaire with a probability of 0.30. What is the probability that both
questionnaires will be
returned? Place your answer, rounded to 2 decimal places, in the blank. For
example, 0.23 is a legitimate
entry.
_________________
Part 8 of 9 Question 18 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g.,
as thousands separator, 5 000), "E" or "e" (used in
scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
Suppose that the average weekly earnings for employees in general automotive
repair shops is $450, and
that the standard deviation for the weekly earnings for such employees is $50.
A sample of 100 such
employees is selected at random.
Find probability that the mean of the sample is less than $445. Place your
answer, rounded to 4 decimal
places, in the blank. For example, 0.2345 would be a legitimate entry.
_______________
Question 19 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g.,
as thousands separator, 5 000), "E" or "e" (used in
scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
A set of final exam scores in an organic chemistry course was found to be
normally distributed, with a
mean of 73 and a standard deviation of 8.
What is the probability of getting a score of 68 or less on this exam? Place
your answer, rounded to 4
decimal places in the blank. For example, 0.3456 would be a legitimate entry.
____________
Question 20 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g.,
as thousands separator, 5 000), "E" or "e" (used in
scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
Suppose that the average weekly earnings for employees in general automotive
repair shops is $450, and
that the standard deviation for the weekly earnings for such employees is $50.
A sample of 100 such
employees is selected at random.
Find the probability that the mean of the sample is greater than $460. Place
your answer, rounded to 4
decimal places, in the blank. For example, 0.2345 would be a legitimate answer.
____________
Question 21 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g.,
as thousands separator, 5 000), "E" or "e" (used in
scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
A Wendy’s fast-food restaurant sells hamburgers and chicken sandwiches. On a
typical weekday, the
demand for hamburgers is normally distributed with a mean of 450 and standard
deviation of 80 and the
demand for chicken sandwiches is normally distributed with a mean of 120 and
standard deviation of 30.
How many hamburgers must the restaurant stock to be 99% sure of not running out
on a given day? Place
you answer, rounded to the nearest whole number in the blank. For example, 345
would be a legitimate
entry.
Question 22 of 25
_________________
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g.,
as thousands separator, 5 000), "E" or "e" (used in
scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
Suppose that the average weekly earnings for employees in general automotive
repair shops is $450, and
that the standard deviation for the weekly earnings for such employees is $50.
A sample of 100 such
employees is selected at random. ____________
Find the standard deviation of the sampling distribution of the means of
average weekly earnings for
samples of size 100. Place your answer in the blank. Do not include a dollar
sign. For example, 7 would be
a legitimate entry.
___________________
Question 23 of 25
1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g.,
as thousands separator, 5 000), "E" or "e" (used in
scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
The manufacturer of a new compact car claims the miles per gallon (mpg) for the
gasoline consumption is
mound shaped and symmetric with a mean of 25.9 mpg and a standard deviation of
9.5 mpg. If 30 such
cars are tested, what is the probability the average mpg achieved by these 30
cars will be greater than 28?
Place your answer, rounded to 4 decimal places, in the blank.
___________
Part 9 of 9 Question 24 of 25
1.0 Points
Using the standard normal curve, the Z- score representing the 99th percentile
is 2.326.
True
False
Reset Selection
Question 25 of 25
1.0 Points
Using the standard normal curve, the Z- score representing the 10th percentile
is 1.28.
True
False
Reset Selection
SET 5
Part 1 of 9 -
Question 1 of 25 1.0 Points
Which of the following are the three most common measures of central location?
A.Mean, median, and variance
B.Mean, median, and standard deviation
C.Mean, variance, and standard deviation
D.Mean, median, and mode
Reset Selection
Part 2 of 9 -
Question 2 of 25 1.0 Points
The table below shows the preferences for elective courses of students who are
undecided about their majors.
Philosophy Digital Art Film Studies
Male 9 16 22
Female 6 18 14
What is the probability of randomly selecting a student who is female or
prefers Digital Art?
A.21.2%
B.84.7%
C.46.2%
D.63.5%
Reset Selection
Question 3 of 25 1.0 Points
If two events are mutually exclusive, what is the probability that both occur
at the same time?
A.0.00
B.0.50
C.1.00
D.Cannot be determined from the information given.
Reset Selection
Part 3 of 9 -
Question 4 of 25 1.0 Points
A die is rolled 360 times. Find the standard deviation for the number of 3s
that will be rolled.
A.60
B.50
C.7.1
D.5.9
Reset Selection
Question 5 of 25 1.0 Points
Suppose that 50 identical batteries are being tested. After 8 hours of
continuous use, assume that a given battery is still operating with a
probability of 0.70 and has failed with a probability of 0.30.
What is the probability that greater than 30 batteries will last at least 8
hours?
A.0.0848
B.0.8594
C.0.9522
D.0.9152
Reset Selection
Question 6 of 25 1.0 Points
If a student randomly guesses at 20 multiple-choice questions, find the
probability that the student gets exactly four correct. Each question has four
possible choices.
A.0.19
B.0.17
C.0.08
D.0.23
Reset Selection
Part 4 of 9 -
Question 7 of 25 1.0 Points
If the value of the standard normal random variable Z is positive, then the
original score is where in relationship to the mean?
A.equal to the mean
B.to the left of the mean
C.to the right of the mean
D.one standard deviation higher than the mean
Reset Selection
Question 8 of 25 1.0 Points
One reason for standardizing random variables is to measure variables with:
A.dissimilar means and similar standard deviations in like terms
B.different means and standard deviations on a non-standard scale
C.different means and standard deviations on a single scale
D.similar means and standard deviations on two scales
Reset Selection
Question 9 of 25 1.0 Points
In a normal distribution, changing the standard deviation:
A.shifts the curve left or right
B.splits the distribution to two curves
C.makes the curve more or less spread out
D.makes the curve more robust
Reset Selection
Question 10 of 25 1.0 Points
The mean of a probability distribution can be:
A.a positive number
B.a negative number
C.zero
D.all of the above
Reset Selection
Question 11 of 25 1.0 Points
Given that the random variable X is normally distributed with a mean of 80 and
a standard deviation of 10, P(85 < X < 90) is
A.0.1915
B.0.3413
C.0.5328
D.0.1498
Reset Selection
Question 12 of 25 1.0 Points
The normal distribution is:
A.a binomial distribution with only one parameter
B.a density function of a discrete random variable
C.a discrete distribution
D.the single most important distribution in statistics
Reset Selection
Part 5 of 9 -
Question 13 of 25 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or
"e" (used in scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
The histogram below represents scores achieved by 250 job applicants on a
personality profile.
The histogram below represents scores achieved by 250 job applicants on a
personality profile.
How many job applicants scored between 10 and 30? Place your answer in the
blank. Do not use any stray symbols. For example, 123 would be a legitimate
answer.
Part 6 of 9 -
Question 14 of 25 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or
"e" (used in scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
Suppose that the probability that a new medication will cause a bad side effect
is 0.03. If this medication is given to 150 people, what is the probability
that more than three of them will experience a bad side effect? Place your
answer, rounded to 4 decimal places, in the blank. For example, 0.1776 would be
a legitimate answer.
Question 15 of 25 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or
"e" (used in scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
A school determines that the number of children X in the families who attend
the school follows the distribution below:
Number of children X 1 2 3 4 5
Probability P(X) 0.20 0.35 0.25 0.15 0.05
What is the mean number of children per family? Round your answer to one
decimal place as necessary. For example, 4.5 would be a legitimate entry.
Answer:
Part 7 of 9 -
Question 16 of 25 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or
"e" (used in scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
According to an Internet posting, 80% of adults enjoy drinking beer. If a group
of 3 adults is selected at random, find the probability that none of them enjoy
drinking beer.
Place your answer, rounded to three decimal places, in the blank. When entering
your answer do not use any labels or symbols other than a decimal point. Simply
provide the numerical value. For example, 0.123 would be a legitimate entry.
Question 17 of 25 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or
"e" (used in scientific notation). NOTE: For scientific notation, a period
MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
A restaurant menu has a price-fixed complete dinner that consists of an
appetizer, entrée, beverage, and dessert. You have a choice of five appetizers,
ten entrees, three beverages, and six desserts. How many possible complete
dinners are possible? Place your answer, as a whole number—no decimal places—in
the blank. For example 176 would be a legitimate entry
Part 8 of 9 -
Question 18 of 25 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or
"e" (used in scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
Scores on a mathematics examination appear to follow a normal distribution with
mean of 65 and standard deviation of 15. The instructor wishes to give a grade
of “C” to students scoring between the 60th and 70th percentiles on the exam.
What score represents the 70th percentile score on the mathematics exam? Place
your answer in the blank, rounded to a whole number. For example, 62 would be a
legitimate entry.
Question 19 of 25 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or
"e" (used in scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
A Wendy’s fast-food restaurant sells hamburgers and chicken sandwiches. On a
typical weekday, the demand for hamburgers is normally distributed with a mean
of 450 and standard deviation of 80 and the demand for chicken sandwiches is
normally distributed with a mean of 120 and standard deviation of 30.
How many hamburgers must the restaurant stock to be 99% sure of not running out
on a given day? Place you answer, rounded to the nearest whole number in the
blank. For example, 345 would be a legitimate entry.
Question 20 of 25 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or
"e" (used in scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
A popular retail store knows that the purchase amounts by its customers is a
random variable that follows a normal distribution with a mean of $30 and a
standard deviation of $9.
What are the two dollar amounts, equidistant from the mean of $30, such that
98% of all customer purchases are between these values? Place your answers in
the blanks provided. Do not include a dollar sign. For example, 14.25 would be
a legitimate entry.
Lower value
Upper value
Question 21 of 25 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or
"e" (used in scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
A popular retail store knows that the purchase amounts by its customers is a
random variable that follows a normal distribution with a mean of $30 and a
standard deviation of $9.
What is the probability that a randomly selected customer will spend $20 or
more at this store? Place your answer, rounded to 4 decimal places, in the
blank. For example, 0.3456 would be a legitimate entry.
Question 22 of 25 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or
"e" (used in scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
Mrs. Smith's reading class can read a mean of 175 words per minute with a
standard deviation of 20 words per minute. The top 3% of the class is to
receive a special award. Assuming that the distribution of words read per
minute are normally distributed, what is the minimum number of words per minute
a student would have to read in order to get the award? Place your answer,
rounded to the nearest whole number, in the blank. When entering your answer do
not use any labels or symbols. Simply provide the numerical value. For example,
123 would be a legitimate entry.
Question 23 of 25 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign
indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or
"e" (used in scientific notation). NOTE: For scientific notation, a
period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and
"b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i}
is not.
Scores on a mathematics examination appear to follow a normal distribution with
mean of 65 and standard deviation of 15. The instructor wishes to give a grade
of “C” to students scoring between the 60th and 70th percentiles on the exam.
What score represents the 60th percentile score on the mathematics exam? Place
your answer in the blank, rounded to a whole number. For example, 62 would be a
legitimate entry.
Part 9 of 9 -
Question 24 of 25 1.0 Points
Using the standard normal curve, the Z- score representing the 10th percentile
is 1.28. True
False
Reset Selection
Question 25 of 25 1.0 Points
The left half under the normal curve is slightly smaller than the right half.
True
False
Solution: APUS Math302 midterm anf final (5 set )