4. Determine the equation for the OC curve for the following sampling plans:

a. N = 500, n1 = 50, c1 = 0, r1 = 3, n2 = 70, c2 = 2, and r2 = 3

b. N = 6000, n1 = 80, c1 = 2, r1 = 4, n2 = 160, c2 = 5, and r2 = 6

c. N = 22,000, n1 = 260, c1 = 5, r1 = 9, n2 = 310, c2 = 8, and r2 = 9

d. N = 10,000, n1 = 300, c1 = 4, r1 = 9, n2 = 300, and c2 = 8

e. N = 800, n1 = 100, c1 = 0, r1 = 5, n2 = 100, and c2 = 4