Answer
$65$ points
Work Step by Step
$z=\frac{y-\mu}{\rho}$
$-2=\frac{y-75}{5}$
$y-75=-2\times5$
$y=75-10=65$
He scored $65$ points.
Stats Modeling the World, 4th Edition
by Bock, David E.; Velleman, Paul F.; De Veaux, Richard D.
Published by
Pearson
ISBN 10:
0133151549
ISBN 13:
978-0-13315-154-1
Chapter 5 - The Standard Deviation as a Ruler and the Normal Model - Exercises - Page 132: 9
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