Posted by **Tera** on Saturday, March 31, 2012 at 11:29pm.

A new process is started, and the sum of the sample standard deviations for 25 subgroups of size 4 is 750. If the specifications are 700 +- 80, what is the process capability index?

What I know:

D2=2.059

USL = 780; LSL = 620; Tolerance = 160

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