How to Calculate Cumulative Frequency?

How to Find the Cumulative Frequency in Statistics?

Cumulative Frequency Calculation

Cumulative Frequency is the total of all the frequency in the frequency distribution. It is constructed by adding up all the previous frequency till the current one in the frequency distribution table. It helps in explaining the data in the form of histograms. The simple tutorial will teach you how to calculate cumulative frequency in simple steps.

Step 1:
Lets consider an example,

Class	Frequency
20 to 40	8
40 to 50	10
50 to 65	5
65 to 80	5
80 to 90	4
90 to 100	1

Step 2:

To find the cumulative frequency of each point, we have to add the frequency at the current position with the cumulative frequency of the previous point. The Cumulative frequency point for the first data will be the same.

Class	Frequency	Cumulative Frequency
20 to 40	8	8
40 to 50	10	8 + 10 = 18
50 to 65	5	18 + 5 = 23
65 to 80	5	23 + 5 =28
80 to 90	4	28 + 4 = 32
90 to 100	1	32 + 1 = 33

A cumulative frequency graph is otherwise called as Ogive. It is curve showing the cumulative frequency in the graphical format.

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