Moment (source code)
= Moment
{title2=$\mathbb E[X^n]$}
{wiki=Moment_(mathematics)}
A <moment> integrates a power of a quantity against a specified <measure>. For a real <random variable> $X$, the $n$th <raw moment> is $\mathbb E[X^n]$ when defined; the $n$th <central moment> instead <measures> powers of deviation from its mean. For equally likely values one and three, the first raw moment is two and the second raw moment is five, while the second central moment is one, its <variance>. Moments summarize features of a law and can be easier to compute than its full <probability distribution>. Even knowing every moment does not always determine the law: that additional property is <moment determinacy>.
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