Question: An automatic machine is making woodscrews with a mean shank length of 50 mm and standard deviation of 2 mm. A certain customer using these

An automatic machine is making woodscrews with a mean shank length of 50 mm and standard deviation of 2 mm. A certain customer using these screws has to check them for length in a special application. He rejects 7% of these screws as too long for this purpose and 4% as too shortWhat are the limits of length to which he must work

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