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Introduction
Arithmetic mean
2. Arithmetic mean
Median
Mode
Summary

## Instruction

The arithmetic mean (or simply mean) is the sum of all observations in the dataset divided by the total number of observations. If we have an n-element dataset containing the values x_1,x_2,...,x_n then the arithmetic mean is defined by this formula:

\overline{x}=\dfrac{x_1+x_2+...+x_n}{n}

If we have a three-element dataset consisting of the numbers 1, 2, and 3, then their sum is 6, and their arithmetic mean is 2.