Hi, I'm unsure where to go with this question:
Let
If a > 0 for what values of b > 0 is f(a,b) the pdf of a continuous variable. Also for what values of a and b is the E(X) = 1/3
So what I'm doing is and then I get . I was thinking to make this equal to 1, but don't no what to do next.
You can't. All you can do is get a in terms of b. If you are expected to simultaneously satisfy the expected value being equal to 1/3, then you solve the following simultaneously:
ab = 2
ba^2 = 1
(I have no idea where your answers in post #3 came from but they are not correct).