Answer
18.6 months
Work Step by Step
We have $\mu=25,\sigma=5$
$P(z)=0.1, z=-1.28$
$z=\frac{X-25}{5}=-1.28, X=18.6$ months
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: 29
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