Statistics & Probability
Basic

Arithmetic Mean

The average of a data set.

Formula

xˉ=1n∑i=1nxi\bar{x} = \frac{1}{n}\sum_{i=1}^{n} x_i

Variables

x_iData values
nNumber of values

Example

The mean of 2, 4, 9 is (2+4+9)/3 = 5.

Did You Know?

The mean is the balance point of the data — the spot where the distribution would perfectly seesaw.

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