The mean is the arithmetic average: add every value and divide by how many there are. It uses all the data, which is also why a single outlier can pull it noticeably.
Math Dictionary / Mean
Mean
The mean is the sum of the values divided by the number of values.
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What it means
It is the arithmetic average.
Also called: average
Examples
| Mean of 2, 4, 9 is 5 |
| 15 total points over 3 games gives mean 5 |
| Mean can be affected by outliers |
Common mistake
Do not forget to divide by how many values there are.
Try one
Question: Find the mean of 6, 8, and 10.
Show answer
(6 + 8 + 10) / 3 = 24 / 3 = 8.