Question: (5) For random variables X, Y, denoting expectations by E[X], E [Y], which of the following are true? [ ] E [X +Y] =E[X] +

(5) For random variables X, Y, denoting expectations by E[X], E

(5) For random variables X, Y, denoting expectations by E[X], E [Y], which of the following are true? [ ] E [X +Y] =E[X] + E [Y] always. [ ] E[X +Y] = E [X] + E [Y] when X and Y are independent (but not always). [ ] E [XY] =E[X] . E [Y] always. [ ] E(XY] = E[X] E [Y] when X and Y are independent (but not always). =

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