Answer
$11.7$ degrees
Work Step by Step
We have $\mu=85, X=100, P(z>z1)=1-P(z1)=0.1$
$P(z1)=0.9, z1=1.28$ from Table E.
$z1=\frac{100-85}{\sigma}=1.28, \sigma=11.7$ degrees
Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition
by Bluman, Allan
Published by
McGraw-Hill Education
ISBN 10:
0078136334
ISBN 13:
978-0-07813-633-7
Chapter 6 - The Normal Distribution - 6-2 Applications of the Normal Distribution - Exercises 6-2 - Page 340: 33
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