3 Sigma Standard Deviation Formula. I have come up with an array formula but the standard deviation it calculates is not correct. To get 3 sigma you need to multiply it by 3.
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If the standard deviation is 2 seconds the same point is 62 or 3 standard deviations away from the mean. It is a symmetric unimodal. The symbol for Standard Deviation is σ the Greek letter sigma.
Multiply three by the standard deviation then add the mean.
You might like to read this simpler page on Standard Deviation first. If A is a vector of observations then the standard deviation is a scalar. Example Question based on Standard Deviation Formula. There is another standard deviation formula which is derived from the variance.
