Answer
(a) $0.0949=9.49\%$
Work Step by Step
(a) Based on the given conditions, $N=1799243$ (total) and $n= 170777$ (for scores higher than 28), thus
$P(x\gt28)=\frac{170777}{1799243}\approx0.0949=9.49\%$
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 98: 3.47a
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