Exercise 1: The joint probability density function of (X, Y ) is given by ________. J(x,y) = (6-I-y) 061<2, 2 0. 2. Use the joint pdf of (X, Y) to compute V(2X - Y). 3. Compute P(X < 1, Y < 3) and P(X + Y < 4). 4. Are X and Y independent random variables? 5. Find the conditional expectation and variance of Y X = 1.