The Empirical Rule
In most cases with normal distributions, about 68.27% of the data will be found within one standard deviation above or below the average. Approximately 95.45% of the data falls within two times the standard deviation range, and around 99.73% falls within three times the standard deviation range. This is often called the “Empirical Rule,” which helps us understand where the majority of data in a normal distribution is located.
In other words, μ ± 1σ covers 68.27% of the area, μ ± 2σ covers 95.45% of the area, and μ ± 3σ represents 99.73% of the area.
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