# Empirical Rule

## Three steps from the mean for 68-95-99.7 percentages

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## Empirical Rule

by CK-12 //basic
Use percentages associated with normal distributions to solve problems.
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## Empirical Rule Principles

by CK-12 //basic
This video gives more detail about the mathematical principles presented in Empirical Rule.
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## Empirical Rule Examples

by CK-12 //basic
This video shows how to work step-by-step through one or more of the examples in Empirical Rule.
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## Normal Distributions and the Empirical Rule

by CK-12 //basic
Explains how to use the empirical rule, also known as the 68-95-99.7 rule, to calculate certain normal distribution probabilities. That's right! You don't always need a calculator!
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• Lesson Plan

## Calculating the Standard Deviation and Normal Distribution Lesson Plan

by CK-12 //basic
This lesson plan covers Calculating the Standard Deviation and Normal Distribution and includes Teaching Tips, Common Errors, Differentiated Instruction, Enrichment, and Problem Solving.
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