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GCSE Geography · key term
The sum of all values divided by the number of values.
Used by AQA, Edexcel and OCR
Paper 1, Paper 2, Paper 3
Revise: Descriptive Statistics: Central Tendency, Spread and PercentagesDividing by the 11 pebbles gives a mean diameter of 7 cm. The mean uses every measurement, so an unusually large or small value can pull it towards that extreme.
Paper 1
The sum of a set of values divided by the number of values: .
Revise: Economic Change, Urbanisation and Regional DisparitiesLower fertility does not mean that the population immediately starts shrinking: births can still outnumber deaths.
Specification 9.3 · Paper 1, Paper 2, Paper 3
The sum of all numerical values divided by the number of values.
Revise: Measures of Central Tendency and SpreadFor an even number, find the mean of the two middle values. The mode is the most frequent value. A dataset can have more than one mode, or no uniquely most frequent value.
Calculate a signed difference as regional value minus mean. Keep the minus sign when a region is below the mean.
Differences between percentage values are measured in percentage points. An unweighted mean of two regions is not the national average.
Keep units: the mean, median, range and inter-quartile range have the same units as the original measurements.
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