wikiHow
Cumulative Frequency Calculator
Cumulative frequency is the running total of the frequencies up to a certain point in a data set. To calculate the cumulative frequency, follow these steps:
1. Arrange the data set in ascending order (from smallest to largest).
2. Create a frequency column that shows how many times each value occurs in the data set.
3. Create a cumulative frequency column that adds up the frequencies as you go down the list.
Here's an example:
Suppose we have the following data set of test scores:
72, 81, 68, 75, 90, 78, 84, 70, 72, 88
To calculate the cumulative frequency:
1. Arrange the data in ascending order:
68, 70, 72, 72, 75, 78, 81, 84, 88, 90
2. Create a frequency column:
1, 1, 2, 1, 1, 1, 1, 1, 1, 1
3. Create a cumulative frequency column by adding up the frequencies as you go down the list:
1, 2, 4, 5, 6, 7, 8, 9, 10, 11
So the cumulative frequency for the test scores would be:
68: 1
70: 2
72: 4
75: 5
78: 6
81: 7
84: 8
88: 9
90: 11
This tells us that there is one score of 68 or lower, two scores of 70 or lower, four scores of 72 or lower, and so on. The final cumulative frequency (11) is equal to the total number of scores in the data set.
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