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The normal distribution

The normal distribution · Diagrams

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Areas within standard deviations

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Areas between μ−σ and μ+σ approximately 68.3%; μ−2σ and μ+2σ approximately 95.4%; μ−3σ and μ+3σ approximately 99.7%. All three shaded regions are centred at the mean.
Areas between μ−σ and μ+σ approximately 68.3%; μ−2σ and μ+2σ approximately 95.4%; μ−3σ and μ+3σ approximately 99.7%. All three shaded regions are centred at the mean.
Areas between μ−σ and μ+σ approximately 68.3%; μ−2σ and μ+2σ approximately 95.4%; μ−3σ and μ+3σ approximately 99.7%. All three shaded regions are centred at the mean.
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