Standard devation from the norm................650 reasons about something At and T..............with the sign of the globe........

If a data distribution is approximately normal then about 68 percent of the data values are within one standard deviation of the mean (mathematically, μ ± σ, where μ is the arithmetic mean), about 95 percent are within two standard deviations (μ ± 2σ), and about 99.7 percent lie within three standard deviations (μ ± 3σ ...

Standard deviation - Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Standard_deviation

Images for standard deviation bell curve

Normal Distribution - Math is Fun

https://www.mathsisfun.com/data/standard-normal-distribution.html

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When we calculate the standard deviation we find that (generally): ... You can see
on the bell curve that 1.85m is 3 standard deviations from the mean of 1.4, so:.

Standard deviation - Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Standard_deviation

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If a data distribution is approximately normal then about 68 percent of the data values are within one standard deviation of the mean (mathematically, μ ± σ, where μ is the arithmetic mean), about 95 percent are within two standard deviations (μ ± 2σ), and about 99.7 percent lie within three standard deviations (μ ± 3σ ...