The joint probability density function of X and Y is given by f(x,y) = x+y 0 < x < 1, 0 < y < 1 (a) Find out the marginal probability density function? (b) E(x) = ? (c) E(y) = ?

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The joint probability density function of X and Y is given by
f(x,y) = x+y           0 < x < 1, 0 < y < 1
(a) Find out the marginal probability density function?
(b) E(x) = ? 
(c) E(y) = ? 
(d) E(xy) = ? 
(e) Cov(x,y) = ? 

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