Answer
(b).
Work Step by Step
Here $n=900,\sigma=125$.
Hence: $\sigma_{\overline{x}}=\frac{\sigma}{\sqrt n}=\frac{125}{\sqrt{900}}\approx4.167$, thus the answer is (b).
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 16 - Confidence Intervals: The Basics - Check Your Skills - Page 387: 16.15
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