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GCSE Mathematics · key term
The sum of all the data values divided by the number of values.
Used by AQA, Edexcel and OCR
Specification S4 · Paper 1, Paper 2, Paper 3
The total of all the values divided by the number of values.
Revise: Measures of Central Tendency and SpreadThe mean, median and mode do this in different ways. The range describes spread instead: it indicates how far the data extends from its lowest to its highest value.
Specification S4 · Paper 1, Paper 2, Paper 3
For an even number of values, the median is the mean of the two middle values—not either middle value by itself.
A grouped-data mean is an estimate because every value in a class is represented by the class midpoint.
When an outlier is present, consider whether the median represents the centre more fairly than the mean. Do not remove an outlier unless there is a justified reason.
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The mean, median and mode are different measures of central tendency. They do not necessarily give the same answer because each describes “typical” in a different way.
Specification 12.03a · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
A value found by adding all the data values and dividing by the number of values.
Revise: Averages and Range for Ungrouped and Grouped DataThe mean, median and mode describe a typical or central value. The range describes how spread out the data is.