Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 12 - Statistics - Chapter 12 Test - Page 838: 18

Answer

student

Work Step by Step

$\text{z-score}=\frac{\text{data item-mean}}{\text{standard deviation}}$. Hence $z_1=\frac{120-100}{10}=2, z_2=\frac{128-100}{15}=1.87$. $z_1\gt z_2$, thus the first person has a higher IQ.
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