Data Handling and Statistics
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.
Worked Example
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.
Practice: Cumulative Frequency
Compute running totals from a frequency table.