2. A certain typing agency employs Al, Bob, and Cathy as typists. The average number of errors per page is...

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2. A certain typing agency employs Al, Bob, and Cathy as typists. The average number of errors per page is 3 when typed by Al, 4.2 when typed by Bob, and 2.1 when typed by Cathy. If your 7-page article is equally likely to be typed by any of the three typists, estimate the probability that it will have no errors. Also estimate the probability it will have at most 3 errors

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