MathGloss/A/Arithmetic Mean

Examples
Suppose we have a list of the following numbers:
 * $$12,10,13,14,16,18,17\,$$

The arithmetic mean is the sum of these numbers, $$100$$, divided by the total number of entries in the list, $$7$$, equal to $$14.285$$
 * $$\overline{x} = \frac{12+10+13+14+16+18+17}{7}=\frac{100}{7}=14.285\,\!$$