Answer
Vocabulary test.
Work Step by Step
$\text{z-score}=\frac{\text{data item-mean}}{\text{standard deviation}}$.
Hence $z_1=\frac{60-50}{15}=2, z_2=\frac{80-72}{6}=1.33$. $z_1\gt z_2$, thus he performed better in the vocabulary test.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 12 - Statistics - Chapter Summary, Review, and Test - Review Exercises - Page 835: 46
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