Factories A and B produce computers. Factory A produces 3 times as many computers as factory B. The probability that an item produced by factory A is defective is 0.019 and the probability that an item produced by factory B is defective is 0.042. A computer is selected at random and it is found to be defective. What is the probability it came from factory A?
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Let the number of computers produced by factory B be x. Then, the number of computers produced by factory A is 3x. Show more…
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