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![Sigma and the probability of events? - Yahoo Answers](https://www.iarticlesnet.com/pub/img/site/s_38.jpeg)
Sigma and the probability of events? - Yahoo Answers
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日期:2024-08-05
Best Answer: a "sigma event" is an event that takes place when the observation is at least 3 standard deviations away from the mean. P( Z < -3) + P(Z > 3) = 0.001349898 + 0.001349898 = 0.002699796 for a 4 ......看更多