AQA GCSE Biology · 8461
Specification 4.2.2.5 · Paper 1
Revise: Health and DiseaseA histogram represents continuous numerical data divided into class intervals.
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GCSE Biology · key term
A graph of grouped continuous data in which adjoining class intervals are represented by touching bars.
Used by AQA and OCR
Specification 4.2.2.5 · Paper 1
Revise: Health and DiseaseA histogram represents continuous numerical data divided into class intervals.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A diagram of touching rectangles used to show grouped numerical data; the area of each rectangle represents its frequency.
Choose a bar chart for separate categories and a histogram for continuous data grouped into class intervals. Leave gaps between bar-chart bars; histogram bars touch.
Use a bar chart for separate categories; for grouped continuous data, use a histogram with touching bars.
When histogram class widths are unequal, obtain frequency from bar area, not bar height alone: frequency = frequency density × class width.
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A histogram is commonly used for continuous numerical data grouped into intervals. Its bars touch because the measurement scale is continuous. The width of a bar represents the class interval, while its area represents frequency.