6.5: Empirical Rule

Difficulty Level: Basic Created by: CK-12
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TermDefinition
Empirical Rule The Empirical Rule is also known as the 68-95-99.7 Rule. When 68% of the data values would be located within 1 standard deviation of the mean, 95% of the data values would be located within 2 standard deviations of the mean, and 99.7% of the data values would be located within 3 standard deviations of the mean, statisticians refer to this as the 68-95-99.7 Rule.
68-95-99.7 Rule When 68% of the data values would be located within 1 standard deviation of the mean, 95% of the data values would be located within 2 standard deviations of the mean, and 99.7% of the data values would be located within 3 standard deviations of the mean, statisticians refer to this as the 68-95-99.7 Rule.
bell curve A normal distribution curve is also known as a bell curve.
normal distributed If data is normally distributed, the data set creates a symmetric histogram that looks like a bell.

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