Answer
3.14%
Work Step by Step
$(64.2-69.4)/2.8) = z$
$-5.2/2.8 = z$
$-1.857 = z$ (rounded to -1.86)
.0314 is the value for z = -1.86
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 3 - The Normal Distributions - Chapter 3 Exercises - Page 97: 3.41
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