Items are inspected for flaws by two quality inspectors. If a flaw is present, it will be detected by the first inspector with probability 0.9, and by the second inspector with probability 0.7. Assume the inspectors function independently.
a. If an item has a flaw, what is the probability that it will be found by both inspectors?
b. If an item has a flaw, what is the probability that it will be found by at least one of the two inspectors?
c. Assume that the second inspector examines only those items that have been passed by the first inspector. If an item has a flaw, what is the probability that the second inspector will find it?
Let A denote the event that the flaw is found by the first inspector, and let B denote the event that the flaw is found by the second inspector.
(a) P(A ? B) = P(A)P(B) = (0.9)(0.7) = 0.63
(b) P(
) = P(A) + P(B) ? P(A ? B) = 0.9 + 0.7 ? 0.63 = 0.97
(c) 
= (1?0.9)(0.7) = 0.07
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