Answer
$45$
Work Step by Step
The mean of a binomial distribution: $\mu=np=60\cdot0.75=45$
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 - Chapter 14 Exercises - Page 342: 14.31b
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