answer all 4 questions with explanation

A discrete distribution in R3 is defined as follows: P.(2,8,1) = 3, P (6,8,1) = -, P (2,8,5)= 30 30 30 P (6,3,5)= 30 ' P. (2,3,9)= 2, P (6,8,5)= 30 30 P (6,8,9)= 30 F. (4,9,7) y FD= (6,3,5) i) Calculate ii) Find de marginals of x, y, z, yz fyddx (vz/ x) iii) Find the conditional density function: iv) Calcula E(X), E(XZ) |