How do I calculate the 3 sigma of a number?
A single number doesn't have a sigma value. Sigma is the standard deviation
of a group of numbers; look up the STDEV function in Excel help.
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David Biddulph
"OGWONE" wrote in message
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The number I'm working with is 1.67E6, and I need the 1st and 3rd sigma
points.
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