# Question: On any given day the probability that the Ohio River

On any given day, the probability that the Ohio River at Cincinnati is polluted by a carbon tetrachloride spill is. 10. Each day, a test is conducted to determine whether the river is polluted by carbon tetrachloride. This test has proved correct 80 percent of the time. Suppose that on a particular day the test indicates carbon tetrachloride pollution. What is the probability that such pollution actually exists?

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