Histograms are a favourite GCSE topic, you need to know
- what grouped data is
- how to calculate the frequency density
The frequency on a Histogram is shown by the area in the box (frequency density x class width)
The class width is often unequal
Histograms are most often used with grouped data
In the diagram below
- there are 20 people aged between 60 and 100
- there are 42 people aged between 40 and 60
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