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.

Software/Applets used on this page
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
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).
(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.
This question appears in the following syllabi:
Syllabus | Module | Section | Topic | Exam Year |
---|---|---|---|---|
AQA AS Maths 2017 | Statistics | Data Presentation and Interpretation | Histograms | - |
AQA AS/A2 Maths 2017 | Statistics | Data Presentation and Interpretation | Histograms | - |
AQA GCSE (9-1) Higher (UK) | S: Statistics | S3: Grouped Data, Histograms and Cumulative Frequency | Histograms | - |
CBSE IX (India) | Statistics | Displaying Data | Histograms | - |
CIE IGCSE (9-1) Maths (0626 UK) | 9 Statistics | B9.4 Graphical Representations | Histograms | - |
Edexcel AS Maths 2017 | Statistics | Data Presentation and Interpretation | Histograms | - |
Edexcel AS/A2 Maths 2017 | Statistics | Data Presentation and Interpretation | Histograms | - |
Edexcel GCSE (9-1) Higher (UK) | S: Statistics | S3: Grouped Data, Histograms and Cumulative Frequency | Histograms | - |
GCSE Higher (UK) | Statistics | Displaying data | Histograms | - |
OCR AS Maths 2017 | Statistics | Working with Data | Histograms | - |
OCR GCSE (9-1) Higher (UK) | 12: Statistics | 12.02b: Grouped Data | Histograms | - |
OCR MEI AS Maths 2017 | Statistics | Working with Data | Histograms | - |
Universal (all site questions) | D | Displaying data | Histograms | - |