probability

Let X and Y be two continuous random variables with joint density function (3x ifOSysxs 1 f (x, y ) = 0 elsewhere and the marginal densities: 3x2 if OSx51 g (x) = 0 elsewhere 3 (1-y' ) if OSys1 h(y) = elsewhere Then a. E(X ) = - and E(Y) b. E(X ) =- - and E(Y ) = N / W DO | W N/ - A / W C. E(X ) =- AW - and E(Y ) = d. E(X ) = - and E(Y)