Answer
89.97%
Work Step by Step
$ z \gt (.9-.8)/.078$
$ z \gt .1/.078$
$z\gt 1.28$
.8997 is the normal value for z = 1.28
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 96: 3.30b
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