Answer
.9868
Work Step by Step
Using a z-test:
P(X > 420) = P(z > -2.22) = P(z < 2.22) = .9868
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 15 - Sampling Distributions - Chapter 15 Exercises - Page 369: 15.30b
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