Thursday, 17 December 2009

Statistics: Histograms

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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