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Electric motors coming off two assembly lines are pooled for storage in a common stockroom, and the room contains an equal number of motors from each...

Electric motors coming off two assembly lines are pooled for storage in a common stockroom, and the room contains an equal number of motors from each line. Motors are periodically sampled from that room and tested. It is known that 10% of the motors from line I are defective and 15% of the motors from line II are defective. If a motor is randomly selected from the stockroom and found to be defective, find the probability that it came from line I.

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