📖 Math Dictionary

Mean

/meen/

Definition

The mean is the average of a set of numbers. Calculate it by adding all values together and dividing by the count of values. It represents the "central" value of a data set.

💡Example

For the numbers 4, 8, 6, 10, 7: Mean = (4 + 8 + 6 + 10 + 7) ÷ 5 = 35 ÷ 5 = 7. The mean is 7.

🎓Used in Grades

Grades 6-12KS3 to GCSEÅrskurs 6-9

✏️Practice Checks

Find the mean of 4, 6, 8, and 10.

Answer: 7

Add the values to get 28, then divide by 4: 28 / 4 = 7.

What happens to the mean if every value increases by 3?

Answer: The mean also increases by 3.

Adding the same amount to every data value shifts the average by that amount.

Which measure is most affected by an extreme outlier?

Answer: The mean.

The mean uses every value in the sum, so an unusually large or small value can pull it away from the typical data point.

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🔗Related Terms

Median Mode

📚Learn More

statistics →mean median mode →data analysis →

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