3. If the joint probability density of X and Y is given by f (x, y) = x+y, 0

3. 4. 5. Ifthe joint probability density of X and Y is given by 0 find ekewhere a. the joint cumulative distribution function of these two random variables. b. Covariance of X and Y. Find k if the joint probability distribution of X , Y and Z is given by f (x, y, z) = kxyz and SMG2013 Probability Ifthe joint probability density Of X , Y and Z is given by (2x -P 3y z) fjr O < x < y < z < I 3 find ekewhere