prove theorem 5.5 in the case of discrete random variables X and Y. hint: use the transformation s= x and t= g(x)y theorem 5.

prove theorem 5.4.5 in the case of discrete random variables X and Y. hint: use the transformation s= x and t= g(x)y

theorem 5.4.5:

if X ans Y are jointly distributed random variables, and g(x) is a function, then

E[g(X)Yx] = g(x)E[Yx]