Answer
18.69 and 25.71 are the quartiles
Work Step by Step
.25 and .75 have normal values of -.675 and .675, respectively.
$(x - 22.2)/5.2 = -.675$
$(x - 22.2) = -3.51$
$ x = 18.69$
$(x - 22.2)/5.2 = .675$
$(x - 22.2) = 3.51$
$ x = 25.71$
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: 3.37
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