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its a statistical term for standard diviation.

in normal distribution if there are six standard deviations between the process mean and the nearest specification limit, then there is a 99.99966% probability that no items will fail to meet specifications .

In six sigma 1.5 sigma correction is considered to allow the natural variation present in any process. So when we say that process is sis sigma , it is nactually 4.5 sigma.

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Q: What does sigma stand for in six sigma?
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