16. Determine the value k so that each of the following functions can serve as a probability distribution of

the discrete random variable X: (3.5/91/W)

(a) f(x) = k(x

2 + 4), for x = 0, 1, 2, 3;

(b) f(x)=k 2Cx

3C3-x , x=0,1,2