Answer
$1175.54
Work Step by Step
We have $\sigma=120, X=1255.94, P(X)=1-0.25=0.75$
Use Table E $z=0.67, z=\frac{1255.94-\mu}{120}=0.67$
we get $\mu=1175.54$
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: 35
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