Answer
5
Work Step by Step
Here we have n = 4, σ = 10
$σ_{x̅} = \frac{σ}{\sqrt n} = \frac{10 }{\sqrt 4} = 5$
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 15 - Sampling Distributions - Apply Your Knowledge - Page 355: 15.10a
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