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Answered 2011-07-01 20:21:24

The sum of the relative frequencies must equal 1 (or 100%), because each individual relative frequency is a fraction of the total frequency. The relative frequency of any category is the proportion or percentage of the data values that fall in that category.

Relative frequency = relative in category/ total frequency

It means a number in that class appeared 20% of the total appearances of all classes

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