An instructor has given a short quiz consisting of two parts. For a randomly selected student, let X = the number of points earned on the first part and Y = the number of points earned on the second part. Suppose that the joint pmf of X and Y is given in the accompanying table. y
p(x, y)
0 5 10 15
x 0 0.03 0.06 0.02 0.10
5 0.04 0.13 0.20 0.10
10 0.01 0.15 0.15 0.01