Answer
0.9772.
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.
Essentials of Statistics (5th Edition)
by Triola, Mario F.
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 261: 14
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