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In the normal distribution with mean μ and standard deviation σ: 68% of the observations fall within 1σ of the mean μ. 95% of the observations fall within 2σ of the mean μ. 99.7% of the observations fall within 3σ of the mean μ. AP Statistics - Summary of Chapter 2. Page 1 of 2.7 Oct 2016 ... This video covers 2.1 (Part 2 of 2) from The Practice of Statistics: Describing Location in a Distribution. We talk about how to transform ...