Essentials of Statistics (5th Edition)

Published by Pearson
ISBN 10: 0-32192-459-2
ISBN 13: 978-0-32192-459-9

Chapter 6 - Normal Probability Distributions - 6-3 Applications of Normal Distributions - Page 262: 17

Answer

119

Work Step by Step

By using the table, the z-score belonging to the area 0.9: z=1.28. $IQ=mean+z\cdot(standard \ deviation)=100+1.28 \cdot 15=100+19.2=119.2\approx119.$
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