Refer to the U.S. Army Corps of Engineers study on the DDT contamination of fish in the
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a. Considering only the contaminated fish captured from the Tennessee River, the data reveal that 52% of the fish are found between 275 and 300 miles upstream, 39% are found from 305 to 325 miles upstream, and 9% are found from 330 to 350 miles upstream. Use these percentages to determine the probabilities P(275 - 300),P(305 - 325), and P(330 - 350).
b. Given that a contaminated fish is found a certain distance upstream, the probability that it is a channel catfish (CC) is determined from the data as P(CC | 275 – 300) = .775, P(CC|305 – 325) = .77, and P(CC|330 – 350) = .86. If a contaminated channel catfish is captured from the Tennessee River, what is the probability that it was captured 275 – 300 miles upstream?
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