Answer
σ = 2.05
Work Step by Step
Using the known values of $n$ and $p$, it follows:
$σ = \sqrt {np (1-p)} = \sqrt {20\times 0.3 (1 - 0.3)} = 2.05$
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 14 - Binomial Distributions - Apply Your Knowledge - Page 335: 14.8b
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