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A histogram is a lot more than a bar chart! In a histogram, the area of the bar, NOT its height, is proportional to frequency. Bars do not have to be of equal width. The height of each bar is called the frequency density.
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Glossary

density

the ratio of the mass of an object to its volume

frequency

Of a function: the rate of repetition of a periodic function.
In statistics: the number of occurances of a value

frequency density

The frequency density of a frequency distribution is given by
(class frequency)/(class width).

histogram

A statistical diagram for continuous data similar to a bar chart but where the area of each bar is proportional to the frequency.

union

The union of two sets A and B is the set containing all the elements of A and B.

Full Glossary List

This question appears in the following syllabi:

SyllabusModuleSectionTopic
AQA AS Maths 2017StatisticsData Presentation and InterpretationHistograms
AQA AS/A2 Maths 2017StatisticsData Presentation and InterpretationHistograms
AQA GCSE (9-1) Higher (UK)S: StatisticsS3: Grouped Data, Histograms and Cumulative FrequencyHistograms
CBSE IX (India)StatisticsDisplaying DataHistograms
CIE IGCSE (9-1) Maths (0626 UK)9 StatisticsB9.4 Graphical RepresentationsHistograms
Edexcel AS Maths 2017StatisticsData Presentation and InterpretationHistograms
Edexcel AS/A2 Maths 2017StatisticsData Presentation and InterpretationHistograms
Edexcel GCSE (9-1) Higher (UK)S: StatisticsS3: Grouped Data, Histograms and Cumulative FrequencyHistograms
GCSE Higher (UK)StatisticsDisplaying dataHistograms
OCR AS Maths 2017StatisticsWorking with DataHistograms
OCR GCSE (9-1) Higher (UK)12: Statistics12.02b: Grouped DataHistograms
OCR MEI AS Maths 2017StatisticsWorking with DataHistograms
Universal (all site questions)DDisplaying dataHistograms