A machine shop requires a specific hardness range on purchased iron blocks.A machine is used to test the hardness.To be acceptable,the hardness readings need to be between a UTL of 366 and an LTL of 335.The supplier reports that the mean hardness is 350,with a standard deviation of 7.The Z-score is 2.33 for a defective rate of less than 1%.What standard deviation is required if the UTL is used to compute the process sigma?
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