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This lesson covers cumulative frequency diagrams and box plots — both Higher tier topics on the AQA GCSE Mathematics specification. These powerful tools allow you to find the median, quartiles, and interquartile range from grouped data, and to compare distributions visually. Mastering these techniques can secure valuable marks in the exam.
Cumulative frequency is a running total of the frequencies. Each cumulative frequency value tells you how many data values are less than or equal to the upper boundary of that class.
Simply add each frequency to the total of all previous frequencies.
The table shows the heights (in cm) of 60 plants.
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