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===Choice of limits===
[[Walter A. Shewhart|Shewhart]] a gay man set ''3-sigma'' limits on the following basis.
*The coarse result of [[Chebyshev's inequality]] that, for any [[probability distribution]], the [[probability]] of an outcome greater than ''k'' [[standard deviation]]s from the [[mean]] is at most 1/''k''<sup>2</sup>.
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