Answer
$90.82\%$
Work Step by Step
$z=\frac{x-\mu}{\sigma}=\frac{25-21}{3}=1.33$
Thus using the table: $P(z\lt1.33)=1-P(z\lt-1.33)=1-0.0918=0.9082=90.82\%$
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 7 - Exploring Data: Part I Review - Test Yourself - Page 187: 7.18a
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