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 267: 8



Work Step by Step

$z_1=\frac{value-mean}{standard \ deviation}=\frac{124-100}{15}=1.6.$ $z_2=\frac{value-mean}{standard \ deviation}=\frac{112-100}{15}=0.8.$ Using the table, the value belonging to 1.6: 0.9452, the value belonging to 0.8: 0.7881. 0.9452-0.7881=0.1571.
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