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GCSE Mathematics · key term
A diagram for grouped numerical data in which class intervals form touching bars and each bar's area represents its frequency.
Used by Edexcel and OCR
Specification S3 · Paper 1, Paper 2, Paper 3
Revise: Grouped and Continuous DataHistograms and cumulative frequency graphs are particularly useful for grouped numerical data. A histogram shows how observations are distributed across the intervals. A cumulative frequency graph instead shows how many observations lie below successive class boundaries, so it is useful for estimating medians, quartiles, percentiles and the number below or above a chosen value.
Specification 12.02b · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
A diagram for grouped continuous data in which each bar's area represents its frequency.
Revise: Histograms and Cumulative FrequencyHistograms reveal how observations are distributed among the intervals, while cumulative frequency graphs reveal how their running total builds up.
For an unequal-width histogram, never use frequency as the bar height. Calculate frequency density for every class.
Remember that frequency is represented by a histogram bar's area, not simply its height. Use .
A histogram has a continuous numerical scale and adjacent bars touch. Do not draw it as a bar chart with gaps.
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