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Given a frequency table,the first cumulative frequency is the same as the first frequency;the second cumulative frequency is the sum of the first cumulative frequency and the second [ordinary] frequency;the third cumulative frequency is the sum of the second cumulative frequency and the third [ordinary] frequency;and so on.An alternative definition is that the cumulative frequency for any value is the sum of all the frequencies less than or equal to that value.
The cumulative frequency is the running total of numbers, such as, frequency cumulative frequency 4 4 5 11 6 17 7 24 8 32
It is 3 more than the cumulative frequency up to the previous class or value.
To calculate cumulative frequency, you first need to have a frequency distribution table. Start by adding up the frequencies of the first category. Then, for each subsequent category, add the frequency to the cumulative frequency of the previous category. The final cumulative frequency will be the total number of observations in the data set.
Cumulative percentage is another way of expressing frequency distribution. It calculates the percentage of the cumulative frequency within each interval, much as relative frequency distribution calculates the percentage of frequency.