Two random variables X and Y have a joint probability density function given by fXY(x, y) = Kxy, 0 < x < 2, 0 < y < 2, and 0 otherwise, then E[XY] .a O 1.47 b O 1.77 .c O 1.67 d O 1.57 :A joint probability density function of two random variables X and Y defined as shown bellow. The marginal PDF of Y is given as the following for 0 < y < 1, and 0 otherwise 21 Jw (2 fr (x, y) = 0