Answer
71.6
Work Step by Step
We have $\mu=64,\sigma=9$, let z1 be the cutoff z value,
$P(z>z1)=1-P(z1)=0.2, P(z1)=0.8$
Use Table E, $z1=0.841,z1=\frac{X-64}{9}=0.841, X=71.6$ which is the cutoff score.
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: 30
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