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Statement of a problem № m842

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Samples of a cast aluminum part are classified on the basis of surface finish (in micro inches) and length measurements. The results of 100 parts are summarized as follows: Length Excellent Good Surface excellent 80 2 Finish good 10 8 Let A denote the event that a sample has excellent surface finish, and let B denote the event that a sample has excellent length. Are events A and B independent?




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