Homework Help: Finite math

Posted by MV on Thursday, May 3, 2012 at 5:32pm.

A newly married couple decides to keep having children until they have a girl. What is the probability that the couple will have at least 5 children?

Distribution Theory - Reggie, Thursday, April 25, 2013 at 3:54pm
This is Geometric distribution.
Let Y be r.v."No: of chldn before a girl"
P(Y=y)=pq^(y-1)...therefore
P(Y=5)=(0.5)(0.5)^(5-1)=0.03125.

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