AVERAGE, But there will be ones at the low and high ends.

　　Point, we have been threeDard Deviations on the right of the average (+3 & sigma;), and three standard deviations to the left of the average (-3 & sigma;).

　　We can also say in layman & rsquo; s terms that 6 & sigma; is the topal spream of the data (iGnoring the 0.3%).

　　be quantify: How capable is the proces? Statistics quantify this by two indices: capability index, abreviated as cp, and process capaability index abbreviated.

　　The space and tolerances overlap). More on this later.

　　Capability index is Calculated with the follow formula:

　　Capability index = Engineering Requirements / Statistics

　　1, the spread is exactly equal to the topal tolerance.

　　Confident that the process is able to mold the parts withIn Dimensions.

　　The Specifications, We Utilize Process Capability Index (CPK). It is Calculated user:

　　Cpk = (usl -x?)/3 & sigma;

　　ordered

　　Cpk = (xs -LSL)/3 & Sigma; (Whichever is Smaller).

　　Where Xx (x Bar) is the average of the data.

　　The more confidence we can be that the molded parts will be in

　　Variations from run to run or for very long runs, some question engineers will add on one more state standing cases defiation as a cushion. This equates to a cpk value of 1.67.