Cumulative frequency is the running total of class frequencies.
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By its very nature, measuring cumulative frequency on either axis of a graph will produce a continuing line on the opposite axis. Therefore, it is impossible to construct a closed frequency polygon when dealing with cumulative frequency.
You just need to add up the frequency total one by one to find the cumulative frequency of a certain set of data.
Cumulative frequency graphs or ogives are used to visually represent how many values are below a certain upper class boundary.
Cumulative frequency
Ogive