Key term

What it means

The mean adds all the numbers and divides by how many there are. The median is the middle number when they are put in order. The mode is the number that appears most often. People use “average” for all three, so it helps to ask which one they mean. A few unusually high numbers can push the mean up a lot.

Example

For incomes of £20,000, £25,000, £30,000, £35,000 and £390,000, the mean is £100,000, but the median is £30,000.

Why it matters

An “average salary” may sound typical even when most people earn much less than that figure.

Related terms

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