Answer
$\approx-0.577$
Work Step by Step
$\overline{x}=\frac{24.3+24.9+24.8}{3}=24.6667$
$z=\frac{\overline{x}-\mu}{\sigma/\sqrt n}=\frac{24.6667-25}{1/\sqrt{3}}\approx-0.577$
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 17 - Tests of Significance: The Basics - Check Your Skills - Page 411: 17.24
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