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Frequency tells you how many values are in one class interval, such as 5<t≤105 < t \le 105<t≤10. Cumulative frequency is the running total as you move through the classes from smallest to largest.
If the frequencies are 777, 111111 and 131313, the cumulative frequencies are 777, 181818 and 313131. A quick check is that the final cumulative frequency should equal the total number of data values.
Question 1
4 marksThe cumulative frequency table shows the height, in cm, of some tomato plants.
| Height | Cumulative Frequency |
|---|---|
| 140<h≤150140 < h \leq 150140<h≤150 | 7 |
| 140<h≤160140 < h \leq 160140<h≤160 | 17 |
| 140<h≤170140 < h \leq 170140<h≤170 | 32 |
| 140<h≤180140 < h \leq 180140<h≤180 | 51 |
| 140<h≤190140 < h \leq 190140<h≤190 | 57 |
| 140<h≤200140 < h \leq 200140<h≤200 | 60 |
What is the definition of cumulative frequency?
Revision notes for Edexcel GCSE Maths Cumulative Frequency. Open the guide for explanations and worked examples. Written against the Edexcel GCSE Maths (1MA1) specification, so the content matches what's examinable rather than general Maths background.
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The frequencies for the intervals 0–10, 10–20, 20–30 and 30–40 are 4, 7, 11 and 6. What is the cumulative frequency up to 30?
