In terms of statistics, when talking of the relative frequency one should mean a certain number of times that an occurrence happened within an experiment, research, some kind of study, etc. As a rule, the relative frequency is presented in the graphical manner, often in the form of a histogram. A histogram serves to represent different data that deals with numbers. It is the most comfortable way to represent the results of a statistical research, like relative frequency because it gives an opportunity to show numerical data in such a way that it can be further analyzed, compared and better understood.
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