Foe below result achieved see calculation of how Mean Value, Standard deviation, Cp & Cpk is calculated in standard SAP

SPC calculation 1.jpg

See below result of Mean Value, Standard deviation, Cp & Cpk is calculated in standard SAP

SPC calculation 2.jpg

From above screen I have taken below reading

SPC calculation 3.jpg

1. Calculation of Mean value

So Mean Value,    = (Sum of Recorded Result) / No. of Record

                         

SPC calculation 4.jpg

          Mean Value     = 38.667                       

SPC calculation 5.jpg                 

SPC calculation 6.jpg                     

The mean (38.667) is closer to one of them than to the other, leading to a Cpk factor (0.17) that is lower than the Cp value (0.22). This implies that the LSL is more difficult to achieve than the USL. Non-conformities exist at both ends of the histogram.

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