Module 8: Background You’ll Need 5

  • Find probabilities and percentiles using the Normal Curve.

Empirical Rule

When a variable has a normal distribution, the Empirical Rule will apply:

  • About [latex]68\%[/latex] of the values will fall within one standard deviation from the mean.
  • About [latex]95\%[/latex] of the values will fall within two standard deviations from the mean.
  • About [latex]99.7\%[/latex] of the values will fall within three standard deviations from the mean.

A diagram detailing the Empirical Rule.