The expected "overall" performance values quantitatively represent the actual process performance. The expected values are calculated based on a normal distribution with the process mean and overall standard deviation.

·    PPM < LSL - expected number of parts per million that have measurements less than the lower specification limit.

·    PPM > USL - expected number of parts per million that have measurements greater than the upper specification limit.

·    PPM Total - expected number of parts per million that have measurements located beyond the specification interval. It is the total of PPM < LSL and PPM > USL.

For the coating data, 292.72 parts per million are expected to have measurements less than the LSL and 100.61 parts per million are expected to have measurements greater than the USL.