**Mean - Wikipedia**
https://en.wikipedia.org/wiki/Mean

There are several kinds of mean in mathematics, especially in statistics: For a data set, the arithmetic mean, also known as average or arithmetic average, is a central value of a finite set of numbers: specifically, the sum of the values divided by the number of values. The arithmetic mean of a set of numbers x1, x2, ..., xn is typically denoted by $${\displaystyle {\bar {x}}}$$ . If the data set were based on a series of observations obtained by sampling from a statistical population, the arithmetic mean is the sample mean (denoted $${\displaystyle {\bar {x}}}$$) to distinguis…

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