Let X and Y be jointly continuous random variables. Each of the parts below has an unfinished equality which can be completed with one of the following options: E[X], E[Y ], X, or Y. Some of these options might be used more than once, and others might not be used at all. After each equal sign, please indicate the appropriate option. For example, if the unfinished equality is Σ x P(X = x) = , then you would write E[X] after the equal sign. You do not need to justify your answer.
Regardless of the relationship between X and Y,
E[E[X |Y]] =