# Find the z-score corresponding to an observation

Question # 00736894 Posted By: Paula Updated on: 09/10/2019 09:42 AM Due on: 10/01/2019
Subject Statistics Topic General Statistics Tutorials:
Question

Question 1

1 / 1 pts

X~N(5.7, 0.61). Find the z-score corresponding to an observation of 4.7.

a    1.64

b   -1.64

c    1.02

d    -1.02

If X~N(mu, sigma) then z= (x-mu)/sigma.brnbsp;brRemember to do the subtraction before dividing by sigma.

Question 2

1 / 1 pts

Scores on an exam follow an approximately Normal distribution with a mean of 74.3 and a standard deviation of 7.4 points. What percent of students scored below 80 points?

a.   0.2206

b.   0.7794

c.   0.8078

d.   0.2297

e.   0.7703

f.     0.1922

To find areas to the left of an observation, first find the z-score, and then look up the area in the middle of the Z table.

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1. ## Solution: Find the z-score corresponding to an observation

Tutorial # 00753039 Posted By: dr.tony Posted on: 03/11/2020 08:26 AM
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