Elementary Statistics (12th Edition)

Published by Pearson

Chapter 6 - Normal Probability Distributions - 6-3 Applications of Normal Distributions - Basic Skills and Concepts: 11

69

Work Step by Step

By using the table, the z-score belonging to the area 1-0.9798=0.0202: z=-2.05. $IQ=mean+z\cdot(standard \ deviation)=100+(-2.05) \cdot 15=100+(-30.75)=69.25\approx69.$

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