Chapter 2 Probability Concepts and Applications

91) Properties of the normal distribution include

A) a continuous bell-shaped distribution.

B) a discrete probability distribution.

C) the number of trials is known and is either 1, 2, 3, 4, 5, etc.

D) the random variable can assume only a finite or limited set of values.

E) use in queuing.

92) Which of the following characteristics is true for a normal probability distribution?

A) The area under the curve is 1.

B) It is symmetrical.

C) The midpoint is also the mean.

D) Sixty-eight percent of the area under the curve lies within one standard deviation of the mean.

E) All of the above are true.

93) The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. What is the probability that a student uses fewer than 600 minutes?

A) 0

B) 0.023

C) 0.841

D) 0.977

E) None of the above

94) The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. What is the probability that a student uses fewer than 400 minutes?

A) 0

B) 0.023

C) 0.159

D) 0.977

E) None of the above

95) The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. What is the probability that a student uses more than 350 minutes?

A) 0.001

B) 0.999

C) 0.618

D) 0.382

E) None of the above

96) The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. What is the probability that a student uses more than 580 minutes?

A) 0.152

B) 0.0548

C) 0.848

D) 0.903

E) None of the above

97) Data for a particular subdivision near downtown Houston indicate that the average price per square foot for a home is $100 with a standard deviation of $5 (normally distributed). What is the probability that the average price per square foot for a home is greater than $110?

A) 0

B) 0.023

C) 0.841

D) 0.977

E) None of the above

98) Data for a particular subdivision near downtown Houston indicate that the average price per square foot for a home is $100 with a standard deviation of $5 (normally distributed). What is the probability that the average price per square foot for a home is greater than $90?

A) 0

B) 0.023

C) 0.159

D) 0.977

E) None of the above

99) Data for a particular subdivision near downtown Houston indicate that the average price per square foot for a home is $100 with a standard deviation of $5 (normally distributed). What is the probability that the average price per square foot for a home is less than $85?

A) 0.001

B) 0.999

C) 0.618

D) 0.382

E) None of the above

100) Data for a particular subdivision near downtown Houston indicate that the average price per square foot for a home is $100 with a standard deviation of $5 (normally distributed). What is the probability that the average price per square foot for a home is less than $108?

A) 0.152

B) 0.097

C) 0.848

D) 0.945

E) None of the above