The relative frequency of a class is the frequency of the class divided by the total number of frequencies of the class and is generally expresses as a percentage.
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Are you talking about a histogram of the relative frequency distribution.
These help to distribute the frequency much better than the latter. The noise might not be as loud or boisterous this way.
Cumulative percentage is another way of expressing frequency distribution. It calculates the percentage of the cumulative frequency within each interval, much as relative frequency distribution calculates the percentage of frequency.
What are the importance of frequency
Probability of event = relative frequency = f/nf is the frequency of the event occurence in a sample of n observances.