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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:

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