Chebyshev’s & Empirical rules
www.csus.edu › s › seriaChebyshev’s & Empirical rules . Chebyshev’s rule. For any data set, the proportion (or percentage) of values that fall within k standard deviations from mean [ that is, in the interval () ] is at least () , where k > 1 . Empirical rule. For a data set with a symmetric distribution , approximately 68.3 percent of the values will fall within one standard deviation from the mean, approximately 95.4 percent will fall within 2 standard deviations from the mean, and approximately 99.7 percent ...