
#1
Oct2009, 12:05 AM

P: 2

So I have a test tomorrow and this question is in a list of review questions and I'm having trouble remembering where the mu fits into the formula. Any help would be greatly appreciated :)
Question: Suppose that X is a random variable with just two possible values a and b. For x = a and b find a formula for p(x) = P(X = x) in terms of a, b and mu = E(X). 



#2
Oct2009, 01:02 AM

Mentor
P: 4,499

If P(X=a)=p and P(X=b)=1p, what can you say about E(X)?



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