SOLUTION: Find the expected number of girls in a family of 7.

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Question 62836: Find the expected number of girls in a family of 7.
Answer by stanbon(48568) About Me  (Show Source):
You can put this solution on YOUR website!
Find the expected number of girls in a family of 7.
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Random variable values: 0,1,2,3,4,5,6,7
Associated probabilities:
P(x=0)=0.007
x=1=0.055
x=2=0.164
x=3=0.273
x=4=0.273
x=5=0.164
x=6=0.055
x=7=0.007
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Add the products of each random variable and its corresponding
probability to get the expected value.
I think the answer is 3.5 but I'll leave the arithmetic to you.
Cheers,
Stan h.