A project manager needs to choose a machine that molds 1-inch p

A project manager needs to choose a machine that molds 1-inch
plastic water pipe. The 1-inch pipe has a specification of 1-inch plus or minus 0.1 inch. Determine which machine he should choose, by computing and interpreting the process capability index for each machine.
If the manager chooses machine A because it is cheaper, what % of the pipes produced will be out of spec?

Machine Standard Deviation (inches)
A 0.08
B 0.06
C 0.05
D 0.02

I think D is the only possible answer based on the process capability index (assuming I’m doing it correctly)? Is this correct and then how do I compute the % of pipes outside specs if machine A was chosen?

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