Cumulative Frequency

Cumulative frequency is a running total of frequencies. Each cumulative frequency is the sum of all frequencies up to and including that class.

Class 1 → 4, Class 2 → 6, Class 3 → 5:

• Cumulative frequency up to class 1 = 4
• Cumulative frequency up to class 2 = 4 + 6 = 10
• Cumulative frequency up to class 3 = 4 + 6 + 5 = 15

The final cumulative frequency always equals the total of all the frequencies.

Compute running totals from a frequency table.

Continue exploring related topics:

• Grouped Frequency Tables - Class Widths and Midpoints
• Frequency Diagrams - Bar Charts and Histograms
• Quartiles - Splitting Data into Four Parts