1.To determine whether or not they have a certain desease, 90 people are to have their blood tested. However, rather than testing each individual separately, it has been decided first to group the people in groups of 10. The blood samples of the 10 people in each group will be pooled and analized together. If the test is negative. one test will suffice for the 10 people (we are assuming that the pooled test will be positive if and only if at least one person in the pool has the desease); whereas, if the test is positive each of the 10 people will also be individually tested and, in all, 11 tests will be made on this group. Assume the probability that a person has the desease is 0.1 for all people, independently of each other, and compute the expected number of tests necessary for each group.

2.The employees of a firm that manufactures insulation are being tested for indications of asbestos in their lungs. The firm is requested to send 3 employees who have positive indications of asbestos on to a medical center for further testing. If 30% of the employees have positive indications of asbestos in their lungs, find the probability that 11 employees must be tested in order to find 3 positives.

Find the variance of the total cost necessary to locate the three positives.