Answer
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Work Step by Step
Any combination of the same four numbers will have the smallest possible standard deviation, since repeats of the same number do not vary from each other.
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 2 - Describing Distributions with Numbers - Chapter 2 Exercises - Page 70: 2.40a
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