AP Statistics

The Bell Curve and the 68–95–99.7 Rule

Why is the normal distribution a bell curve, and what does 68–95–99.7 mean?

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AP Statistics3 scenes · 1:20

Why is the normal distribution a bell curve, and what does 68–95–99.7 mean?

  1. 1Why the Bell Curve Emerges
  2. 2Measuring Spread with Standard Deviation
  3. 3The 68–95–99.7 Rule
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What this lesson covers

  1. 1Why the Bell Curve Emerges
  2. 2Measuring Spread with Standard Deviation
  3. 3The 68–95–99.7 Rule