The 3-sigma rule describes the distribution of observations in a skewed distribution.

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The 3-sigma rule, also known as the empirical rule, describes the distribution of observations in a normal (bell-shaped) distribution, not a skewed distribution. It states that about 68% of values fall within one standard deviation of the mean, about 95% within two standard deviations, and about 99.7% within three standard deviations.

The 3-Sigma Rule Describes the Distribution of Observations in a Skewed