What is process capability ratio for extruder operations

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At the extruder station, the rubber for the AX-572 tires has a customer-based thickness specification of 400+10 thousandth of an inch (thou). Lower Tolerance Limit: LTL = 400 - 10 = 390 thou Upper Tolerance Limit: UTL = 400 + 10 = 410 thou Susan Douglass, vice president, of quality at Flyrock Tires and her staff had analysed many samples of output from the extruder, and determined that the output produced by the extruder has a thickness that was normally distributed with a mean of 400 and standard deviation of 4 thou. What is the process capability ratio for extruder operations? What is the corresponding sigma measure of the process? If Susan wants to make the extrusion process, a six-sigma process, how much should she reduce the standard deviation of this process?

Reference no: EM133960925

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