Answer
option (a)
Work Step by Step
We know the following equation:
$\mu = np$
Thus, using the values of $n$ and $p$, it follows:
$\mu = 80 \times 0.2 = 16$
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 - Check Your Skills - Page 340: 14.21
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