Five brothers and their wives decide to have children until each family has two female children. What is the pmf of X = the total number of male children born to the brothers? (Enter combinations using the formula
 |
| n |
| r |
 |
=
| n! |
| r!(n − r)! |
.
|
|
Homework Answers
P(X=x)=((x+9)!/(x!*9!))*(0.5)x+10
E(X) =r/p-10 =10/0.5-10 =10
it is equal to 5 times the expected number of male children born to each brother
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