Mean

A measure of the average value

1. of a sample

Given a sample of $$n$$ values $$x_i$$, the mean is defined as
$\frac{1}{n}\sum_{i=1}^{n}x_i$
where $$\sum$$ is the summation sign.

2. of a distribution

For a random variable $$X$$ with the distribution in question, the mean is equal to the expectation of the function
$f(X) = X$

Gallimaufry

 AKCalc ECMA Endarkenment Turning Sixteen

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