5.6 Two discrete random variables X and Y have the joint PMF given by 0.2 x=1,y=1 0.1 x=1,y=2 0.1 x=2,y=1 Pxx(x,y)=} 0.2 x=2,y=2 0.1 x=3,y=1 0.3 x=3,y=2 0 otherwise Determine the following: a. the marginal PMFs of X and Y (i.e., px(x) and py(y)) b. the conditional PMF of X given Y, px|x(xy) c. whether X and Y are independent.