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# Solved: Using the Central Limit Theorem. In Exercises use ISBN: 9780321836960 18

## Solution for problem 7BSC Chapter 6.5

Elementary Statistics | 12th Edition

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Problem 7BSC

Using the Central Limit Theorem. In Exercises use this information about the overhead reach distances of adult females:μ = 205.5 cm,σ = 8.6 cm, and overhead reach distances are normally distributed (based on data from the Federal Aviation Administration). The overhead reach distances are used in planning assembly work stations.

a. If 1 adult female is randomly selected, find the probability that her overhead reach is greater than 218.4 cm.

b. If 9 adult females are randomly selected, find the probability that they have a mean overhead reach greater than 204.0 cm.

c. Why can the normal distribution be used in part (b), even though the sample size does not exceed 30?

Step-by-Step Solution:

Step 1 of 2</p>

The overhead reach distances of adult females = 205.5 cm and = 8.6 cm and overhead reach distances are normally distributed. The overhead reach distances are used in planning assembly work stations.

a. If 1 adult female is randomly selected, the probability that her overhead reach is greater than 218.4 cm.

We are dealing with individual value from a normally distributed population so mean is 205.5 cm and standard deviation is 8.6 cm.

The Test Statistic can be expressed as  Z  = 1.5

To find the associated probability, we have

P( )

P(Z > 1.5) = 1 - P(Z 1.5)

= 1 - 0.9332 (From Area Under Normal Curve table)

= 0.0668

Step 2 of 2

##### ISBN: 9780321836960

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