Answer
(c) 11.5
Work Step by Step
The standard deviation of the distribution will be given by $\frac{σ}{\sqrt n}$
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 - Check Your Skills - Page 368: 15.21
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