Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 6 - Normal Probability Distributions - 6-3 Applications of Normal Distributions - Basic Skills and Concepts - Page 268: 18



Work Step by Step

By using the table, the z-score belonging to the area 0.25: z=-0.667. $IQ=mean+z\cdot(standard \ deviation)=100+(-0.667) \cdot 15=100+(-10)=90.$
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