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For this example,
once size has been checked, the hole may be probed to
determine how close the surface is to the virtual
condition of 59.5mm. By recording these values over
time, an average and standard deviation of the values
may be determined. Calculating the difference between
the average of these values and the virtual condition
boundary, then dividing that difference by 3 standard
deviations will yield a Cpk.
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