Suppose X and Y are independent random variables having the joint probability distribution:

f(x, y)	X=2	X=4
Y=1	0.10	0.20
Y=3	0.15	0.30
Y=5	0.20	0.05

Find:
(i) marginal probability distribution of X and Y.
(ii) E(X)
(iii) E(Y)
(iv) E(2X+3Y)
(v) E(XY).