Blood is taken from each of n individuals to be tested for a certain disease. Rather than
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a. Let X represent the number of tests that are carried out. What are the possible values of X?
b. Assume that n = 4 individuals are to be tested, and the probability that each has the disease, independent of the others, is p = 0.1. Find μX.
c. Repeat part (b) with n = 6 and p = 0.2.
d. Express μX as a function of n and p.
e. The pooled method is more economical than performing individual tests if μX < n. Suppose n = 10. For what values of p is the pooled method more economical than performing n individual tests?
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