Answer
$\approx0.4219$
Work Step by Step
The formula for a binomial probability: $P(X=k)={n\choose k}p^k(1-p)^{n-k}$
Hence $P(X=3)={4\choose 3}0.75^3(1-0.75)^{4-3}\approx0.4219$
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: 14.31a
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