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Statistics 101

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.