Posted by **Julie** on Tuesday, April 26, 2011 at 5:22pm.

Factories A and B produce computers. Factory A produces 2 times as many computers as factory B. The probability that an item produced by factory A is defective is 0.012 and the probability that an item produced by factory B is defective is 0.04.

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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