Answer
89.44%
Work Step by Step
$ (.6-.8)/.078 \lt z \lt (.9-.8)/.078$
$-.2/.078 \lt z \lt .1/.078$
$-2.56 \lt z \lt 1.28$
-2.56 has a normal value of .0052
1.28 has a normal value of .8997
$.8997 - .0052 = .8944$
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: 3.30c
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