What is the cumulative frequency curve of statistical data commonly called?

What is cumulative frequency?

What is cumulative frequency of marks less than 15

Graph of Cumulative Frequency

Draw the cumulative frequency curve for the following given data :

Make a frequency curve of the following data :

The abscissa of the point of intersection of the less-than type and of the more-than type cumulative frequency curves of a grouped data gives

Cumulative Frequency Distribution