5. Formal properties of the relative frequency

A frequency distribution is a distribution that shows how often something happens. with relative frequency distribution, we don’t want to know the counts. We want to know the percentages.

Relative frequency of a class = class frequency/n, where Class frequency refers to the number of observations in each class; n represents the total number of observations in the entire data set.

below are the four properties of relative frequency.

  1. the relative frequency of a class is greater than or equal to zero(fi >= 0).
  2. the relative frequency of a population is 1 (fn = 1)
  3. there is no common relative frequency between classes(i.e fi ∩ fj = Ø)
  4. freq(Ci ⋃ Cj) = freq(Ci) + freq(Cj)