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Random variables X and Y have the joint pdf fXY (x,y) = x + y, for 0 < x < 1 and 0 < y

Random variables X and Y have the joint pdf fXY (x,y) = x + y, for 0 < x < 1 and 0 < y < 1. a) Determine marginal pdf's of X and Y. b) Are X and Y statistically independent?

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