
A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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Transcribed Image Text:4. A newly married couple wants to have children until they obtain children of both sexes.
The events of having a boy or girl are independent and equiprobable. Let X be the
random variable that counts the number of children that the couple has until obtaining
children of both sexes. For example, X (bbbbbbg) = 7 and X(ggggggggb) = 9 where
b stands for 'boy' and g stands for 'girl'. (Note that X is not a negative binomial
random variable because having a girl or a boy is considered a success. In fact, X is
not one of the standard discrete random variables discussed in class.)
(a) Write down the pmf of X, and do not forget to indicate the range of values that
x can take on.
px (x) =
(b) What is the probability that the couple will have to have at least five children to
obtain children of both sexes? Express your answer as a fraction.
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