Answer
27.4% of the students had scores between 20 and 25.
Work Step by Step
$(20-25.3)/6.5 \lt z \lt (25-25.3)/6.5$
$-5.3 /6.5 \lt z \lt -.3/6.5$
$-.815 \lt z\lt -.046$
z-value for -.82 = .2061
z-value for -.05 = .4801
$.4801 - .2061 = .274$
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 - Apply Your Knowledge - Page 91: 3.12b
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