# Mean

The mean of a set of numbers, x_{1}, x_{2},.x_{n} is defined to be (x_{1} + x_{2}...+ x_{n}) ÷ 4n. Thus the mean of 2, 3, 7, and 5 is (2 + 3 + 7 + 5) ÷ 4 = 17 ÷ 4.

The mean is also known as the average. It is one of the measures of central tendency, the others being the mode and **median**.

## Additional topics

Science EncyclopediaScience & Philosophy: *Mathematics* to *Methanal trimer*