Question: 4. Let X and Y be jointly Normal random variables with parameters P4X: 0, 02x: 1, BY: -1, day = 4, and p = -5.

4. Let X and Y be jointly Normal random variables with parameters P4X: 0, 02x: 1, BY: -1, day = 4, and p = -5. a) Since X and Y are jointly Normal, U=X+Y is normal. Find the parameters (mean and variance) of U. b) Find the constant a if we know (aX+Y) and (X+2Y) are independent. 0) If U=X+Y and V=2X-Y, nd the CorrelationCU, V)

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