# Normal Distribution

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Normal Distribution

As stated before, the standard deviation is a measure of the spread of a distribution. Here are several normal curves with the same center, but different population standard deviations:

- 68% of the area of the curve is within the range of μ ± 1σ
- 95% of the area of the curve is within the range of μ ± 2σ
- 99% of the area of the curve is within the range of μ ± 3σ