Answer
$2.4$
Work Step by Step
The expected number of infections among the $17$ unvaccinated kids is the mean of the binomial distribution with $n=3$ and $p=0.8$.
The mean of a binomial distribution: $\mu_2=np=3\cdot0.8=2.4$
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 343: 14.40b
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