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: 14



Work Step by Step

$z=\frac{value-mean}{standard \ deviation}=\frac{70-100}{15}=-2.$ Using the table, the value belonging to -2: 1-0.0228=0.9772.
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