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Data Science & Statistical Analysis• 6 min read
The Normal Distribution & Empirical Rule
Master the Gaussian Bell Curve, the 68-95-99.7 Empirical Rule, and calculating Z-Scores.
The 68-95-99.7 Empirical Rule
In any normal distribution:
~68% of observations fall within ±1 standard deviation of the mean.
~95% of observations fall within ±2 standard deviations.
~99.7% of observations fall within ±3 standard deviations (data points beyond this are rare outliers).
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Test Yourself With Exercise
According to the Empirical Rule, what percentage of values in a normal distribution lie within 2 standard deviations of the mean?