Answer
Mathematics
Work Step by Step
French:
$z=\frac{y-\mu}{\rho}$
$z=\frac{82-72}{8}=1.25$
Mathematics:
$z=\frac{y-\mu}{\rho}$
$z=\frac{86-68}{12}=1.5$
As $1.5>1.25$, it follows that she did better in mathematics.
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: 12
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