Answer
$3.25$
Work Step by Step
The expected value among the $20$ kids is the sum of the results from (a) and (b), thus $\mu=\mu_1+\mu_2=0.85+2.4=3.25$
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: 14.40c
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