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Year 7 · Statistics & Probability

Mean, median, mode and range

Averages describe a set of numbers: mean, median, mode and range.

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How to do it

  1. Mean: add them all, divide by how many.
  2. Median: put in order, take the middle one.
  3. Mode: the most common. Range: biggest − smallest.

Worked example

Median of 9, 3, 7, 1, 5
In order: 1, 3, 5, 7, 9
The middle value is 5

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Put the numbers in order before finding the median.

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