Answer
20th percentile (20.33%)
Work Step by Step
$(37.2-39.1)/2.3 = z$
$-1.9/2.3 = z$
$-.826 = z$ (rounded to -.83)
.2033 is the value for z = -.83
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: 3.39a
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