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
$.8997 - .0052 = .8944$
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