2. The continuous random variables X and Y have known joint probability density function 4x 0≤ y ≤x≤1 fxy(x, y) given by fxr (x, y) = y +1 0 a) Determine the covariance otherwise cov(X,Y) of the random variables X and Y. b) Determine the correlation coefficient Pxx of the random variables X and Y. c) Determine the expected value E{g(X,Y)} for the case where g(x, y) = x² + y². d) Determine the variance var {X + Y}.

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