Relative frequency distributions

As Table 1-2 shows, a grouped frequency distribution can be transformed into a relative frequency distribution, which shows the percentage of all the elements that fall within each class interval. The relative frequency of elements in any given class interval is found by dividing /, the frequency (or number of elements) in that class interval, by n (the sample size, which in this case is 200). By multiplying the result by 100, it is converted into a percentage. Thus, this distribution shows, for example, that 19% of this sample had serum cholesterol levels between 211 and 220 mg/dl.

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