Question: . [ 1 0 points ] Suppose that a quality characteristic is normally distributed with specifications at 1 5 0 pm 2 0 .

.[10 points] Suppose that a quality characteristic is normally distributed with
specifications at 150\pm 20. Natural tolerance limits for the process are 150\pm 18.
(a) Calculate the process standard deviation.
(b) Calculate PCR and PCRk of the process. Calculate the percentage of the specification
width used by the process.

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