the first references of six sigma as a standard of measurement can be traced back to the German mathematician Carl Frederick Gauss (1777-1855), who introduced the concept of a curve in the shape of "the Bell", which represents the variation. later, in 1920, the Six Sigma started to be a symbol for a unit in a change in the quality of a product or a service, when the Walter Shewhart indicated that the three Sigma from the middle of the curve is the point where required to make a correction to a process.
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