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Cumulative Frequency is The total of a frequency and all frequencies so far in a frequency distribution. It is the 'running total' of frequencies in the frequency distribution table.
a cumulative frequency graph mearsure the cumulative frequency on the y-axis and the class boundaries on the x-axis
In a Frequency Polygon, a line graph is drawn by joining all the midpoints of the top of the bars of a histogram. A frequency polygon gives the idea about the shape of the data distribution. The two end points of a frequency polygon always lie on the x-axis.
This merely means 'adding it up as you go along', so for each frequency of each data set, you merely add up the frequency total.