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A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Suppose that P(male birth) = 0:55. A couple wishes to have exactly two female children in
their family. They will keep having children until this condition is fulfilled. What is the probability that
the family has five children?

Expert Solution
Step 1

Given that the probability of male birth is 0.55 then the probability of female birth is 1-0.55 = 0.45

Number of success = 2 ( they want exactly 2 female children) 

And X=5 

Then X~ Negative binomial (x,r=2, p=0.45)

 

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