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The heights of a group of men averaged 69 inches and followed the normal curve. The 91st percentile height was 73.4 inches. Find the 9’th percentile height. Approximate the SD.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

The heights of a group of men averaged 69 inches and followed the normal curve. The 91st percentile height was 73.4 inches.

Find the 9’th percentile height.

Approximate the SD.

Expert Solution

Step 1

Solution:

Let X be the height of group of men.

$μ = 69 i n c h e s$ Average height of men.

The 91st percentile height was 73.4 inches that is P( X< 73.4)= 0.91.

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