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The Greek letter sigma is used to denote a selection operation: select * from foo where bar = 10;
The symbol for standard deviation is pronounced as "sigma" in statistics. It is represented by the Greek letter σ. In mathematical and statistical contexts, σ is commonly used to denote the standard deviation of a population or a sample.
what is eoor 2% at 2 sigma
3 Sigma is 66800 defects per million pieces You can check out the number of defective pieces per million & the % accuracy for all Sigma levels in the six sigma conversion chart in the related links section
4.5 Sigma is 1350 defects per million pieces You can check out the number of defective pieces per million & the % accuracy for all Sigma levels in the six sigma conversion chart in the related links section