Statistics - Cumulative plots

A cumulative plot is a way to draw cumulative information graphically. It displays the number / percentages, or proportion of observations that are less than or equal to particular value.

Example

Problem Statement:

Draw the frequency and comulative frequency plots of 10 student test scores based on following data.

Solution:

For the frequency chart, compute the frequecies as shown below. This table show the no. of students scoring in given ranges.

Following is the required frequency plot

For the comulative frequency chart, compute the frequecies as shown below. This table show the no. of students scoring upto given marks(including).

Following is the required frequency plot