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Suppose X and Y are continuous random variables with joint density function fX;Y (x; y) =...

Suppose X and Y are continuous random variables with joint density function fX;Y (x; y) = x + y on the square [0; 3] x [0; 3]. Compute E[X], E[Y], E[X2 + Y2], and Cov(3X - 4; 2Y +3).

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