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Water specimens contain nitrates, a solution that is dropped into the water will cause the specimen to turn red 95% of the time. When used on water specimens without nitrates, the solution turns the water red 10% of the time. Past experience in the lab indicates that nitrates are contained in 30% of the water specimens that are sent to the lab for testing. If a water specimen is randomly selected

1. from among those sent to the lab, what is the probability that it will turn red when tested?

2. and turns red when tested, what is the probability that it actually contains nitrates?

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