Question 579276: To determine whether or not they have a certain desease, 50 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 0.02 for all people, independently of each other, and compute the expected number of tests necessary for each group.
Answer by edjones(8007)   (Show Source):
You can put this solution on YOUR website! 50*.02=1 person in the 50 is expected to have the disease.
1 test is required for each of the 4 groups the diseased person is not in and 11 tests for the group he is in. 15 tests expected total.
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Ed
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