1) Determine whether the following can be probability distribution of a discrete random variable X (defined in each case only for the given values of x). Please, explain your answer briefly! a. X - 3 0 1 400 p(x) 0.20 0.40 0.39 0.01 b. P (X= x) = p(x) = s for x = 0, 1, 2, 3, 4,5 C. P(X = x) = p(x) = (x+1)/14 for x = -2,3,4,5