Averages Summary

GCSE Maths

There are three types of average: mean, median and mode.

The mean average is found by adding up all the numbers, and dividing by the number of numbers.

Mean average = total of quantities ÷ number of quantities

The median is simply the number that lies at the centre of a set of numbers, when they have been arranged numerically.

If a set of numbers has an even total, the median is the mean of the two middle numbers.

The mode is the most popular number in a set: in other words the one that occurs the most.

The range of a set of numbers is how widespread they are. It is found by subtracting the smallest from the biggest number.

Range = biggest number - smallest number

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