Normal CurveHigh School · Statistics & Probability · HSS-ID.A.4
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High School · Statistics & Probability · Think & learn · Ages 14–18

Normal Curve

Maths standardHSS-ID.A.4Use the mean and standard deviation of a normal distribution to estimate percentages (the 68–95–99.7 rule).

  1. About 68% of data is within 1 SD of the mean, 95% within 2, 99.7% within 3.
  2. The curve is symmetric: each half holds 50%.
  3. Split bands in half and add pieces together.
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