Cumulative Frequency Graph

A Cumulative Frequency Graph is a graph plotted from a cumulative frequency table. A cumulative frequency graph is also called an ogive.

Example :

Draw a cumulative frequency graph for the frequency table below.

Solution:

We need to add a class with 0 frequency before the first class and then find the upper boundary for each class interval.

And then plot the cumulative frequency against the upper class boundary of each interval and join the points with a smooth curve.

The following video shows how to obtain a cumulative frequency graph from a cumulative frequency table.

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