The frequency distribution usually refers to empirical measurement and there is no formula for finding it. You simply count the number of times an observation falls within a given range.
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The formula for finding probability depends on the distribution function.
Are you talking about a histogram of the relative frequency distribution.
What are the importance of frequency
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.
binominal distribution