Let X=R(0,1) and Y=Bi(1,0.5) be independent random variables, Z=X^Y.
1. Compute the function n(y)=E(Z|Y=y) and hence specify the rv E(Z|Y).
2. Compute the function S(y)=var(Z|Y=y) and hence specify the rc var(Z|Y).
3. Compute E(Z).
How do I do the questions?
1. When Y = 0, Z = 1 and E(Z) = 1. So n(0) = 1.
When Y = 1, Z = X and E(Z) = E(X) = 1/2.
2. When Y = 0, Z = 1 and Var(Z) = 0. So S(0) = 0.
When Y = 1, Z = X and Var(Z) = Var(X) = 1/12. So S(1) = 1/12.
3. I think it will be
Someone might jump in to confirm or deny this ......
By the way, there's an interesting question if X = R(0,1) and Y = R(0,1) ......
Part 3: Clearly either Z = Z^0 = 1 or Z = X^1 = X. Each obviously occurs with probability 1/2. Obviously E(1) = 1. When Z = X, E(Z) = E(X) = 1/2, as stated in my answer to part 1. Remember that X ~ R(0, 1).
It should be clear from all this where my answer has come from.
You started off with "I have no idea where to get the answer". I've given you a lot of food for thought. It's time now for you to step up to the plate.