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7. Suppose that random variables X and Y have a joint density function given by: f(x,...

7. Suppose that random variables X and Y have a joint density function given by: f(x, y) = ? + ? 0 ≤ ?≤ 1, 0 ≤ ? ≤ 1

(a) Find the density functions of X and Y, f(x) and f(y).

(b) Find E[X] and Var(Y).

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