Problem 4: Two continuous random variables X and Y have a joint PDF given by: fXY(x,y)={Axy,0, when0x2,0y2else (a) Find the value of the parameter A. (b) Find P(XY1). (c) Find E[XY]. (d) Find the PDF of X and the PDF of Y. (e) Find E[X] and E[Y]. Are the two variables uncorrelated?.