Cumulative Frequency

Definition of Cumulative Frequency

Cumulative Frequency corresponding to a particular value is the sum
of all the frequencies up to and including that value.

More About Cumulative Frequency

    Cumulative frequency is nothing but the running total of frequencies.

Video Examples: Cumulative Frequency


Example of Cumulative Frequency

    The cumulative frequency table represents the volcanic eruptions between 1900 and 2000.
       example of Cumulative Frequency
    As we see above, the cumulative frequency for the total number of
    volcanic eruptions that took place in the years during 1920-40 is 12 + 15 = 27.

Solved Example on Cumulative Frequency

Ques: Jack tabulated the number of cars sold in a week by an automobile company.
Use cumulative frequency to find the total number of cars sold in that week.
     example of Cumulative Frequency

    Choices:
    A. 32
    B. 35
    C. 16
    D. 19
    Correct Answer: B

Solution:

    Step 1: Cumulative frequency corresponding to a particular value is the sum of all the
    frequencies up to and including that value.
    Step 2: Use cumulative frequency table to find the total number of cars sold in a week.
       example of Cumulative Frequency

    Step 3: From the table, the total number of cars sold by the company in a week is 7 + 9 + 15 + 4 = 35.

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