A Machine Shop Requires a Specific Hardness Range on Purchased

question 55

Essay

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.What would the percent defective be for this process using the LTL?

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