Question: 4. Let the joint probability density function of random variables X and Y be Find E(X), E(Y ), and E(X2 + Y 2). f(x, y):

4. Let the joint probability density function of random variables X and Y be

f(x, y): 2e-(x+2y) if x 0, y 0 === 0 otherwise.

Find E(X), E(Y ), and E(X2 + Y 2).

f(x, y): 2e-(x+2y) if x 0, y 0 === 0 otherwise.

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