Answer
4.05
Work Step by Step
We have $\mu=19.4, X=22.8, P(z)=1-0.2=0.8$
Use Table E, $z=0.84, z=\frac{22.8-19.4}{\sigma}=0.84, \sigma=4.05$
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 339: 24
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