Consider the double sampling plan for Spire CDs presented in this section.

a. Suppose that the true proportion of defectives in the lot is 10 percent. On average, how many items will have to be sampled before the lot is either accepted or rejected?

b. Suppose that the true proportion of defectives in the lot is 30 percent. On average, how many items will have to be sampled before the lot is either accepted or rejected?