Answer
Let event x = both of the children will be boy
x = 1/4
Let y = at least one of the children is a boy
Thus y = 3/4
P(x | y) = P(x and y) / P(y)
= 1/4 / 3/4
= 1/3 = 0.333
Work Step by Step
As given above
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 13 - General Rules of Probability - Chapter 13 Exercises - Page 322: 13.38a
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