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# Empirical Rule

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

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
• Read

## Empirical Rule

by CK-12 //basic

Use percentages associated with normal distributions to solve problems.

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• Video

## Empirical Rule Principles

by CK-12 //basic

This video gives more detail about the mathematical principles presented in Empirical Rule.

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• Video

## 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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• Video

## 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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