Plumber Bob does 40% of the plumbing jobs in a small town. 30% of the people in
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Plumber Bob does 40% of the plumbing jobs in a small town. 30% of the people in town are unhappy with their plumbers, but 50% of Bob’s customers are unhappy with his work. If your neighbor is not happy with his plumber, what is the probability that it was Bob?
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