The in-control mean of the inside diameter of an 'O' ring is 1.426" and the in-control standard devi


Question: The in-control mean of the inside diameter of an 'O' ring is 1.426" and the in-control standard deviation is 0.0010. The inside diameters are normally distributed.

(a) What are the control limits of the X chart, if a = 0.0026 and the sample size is 4?

(b) Find the proportion of rejected .0' rings when the process is in control, if the tolerance limits are 1.426 \(\pm \) 0.0015.

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