InShOt Sigma

The sigma rule, also known as the "68-95-99.7 rule" or the "three-sigma rule," is a statistical rule that describes the percentage of values that fall within a certain number of standard deviations from the mean of a normal distribution. Specifically, the sigma rule states that:

Approximately 95% of all values in a normal distribution will fall within two standard deviations of the mean.
Approximately 99.7% of all values in a normal distribution will fall within three standard deviations of the mean.
The sigma rule is used to help interpret data and understand the variability of a distribution. It is also used in quality control and process improvement to identify outliers and determine if a process is stable or if there are significant variations.

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