The Basic Practice of Statistics 7th Edition

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

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
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