Answer
(b) $0.1262=12.62\%$
Work Step by Step
(b) Based on the given conditions, $N=1799243$ (total) and $n'= 170777+56351=227128$ (for scores equal or higher than 28), thus
$P(x\ge28)=\frac{227128}{1799243}\approx0.1262=12.62\%$
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: 3.47b
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