Latest build deployed.

2026-01-11 13:24:27 -05:00
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+<body class="ignore-math">
+<article class="definition definition-like"><h3 class="heading">
+<span class="type">Definition</span><span class="space heading-divison-mark heading-divison-mark__space"> </span><span class="codenumber">3.2.1</span><span class="period heading-divison-mark heading-divison-mark__period">.</span>
+</h3>
+<div class="para logical">
+<div class="para">Let <span class="process-math">\(X\)</span> be a random variable. The <dfn class="terminology">variance</dfn> of <span class="process-math">\(X\)</span> is:</div>
+<div class="displaymath process-math">
+\begin{gather*}
+\Var(X) = \E\left[ \left(X - \E(X)\right)^2 \right].
+\end{gather*}
+</div>
+<div class="autopermalink" data-description="Paragraph"><a href="#def-variance-1-1" title="Copy heading and permalink for Paragraph" aria-label="Copy heading and permalink for Paragraph">🔗</a></div>
+</div>
+<div class="autopermalink" data-description="Definition 3.2.1"><a href="#def-variance" title="Copy heading and permalink for Definition 3.2.1" aria-label="Copy heading and permalink for Definition 3.2.1">🔗</a></div></article><span class="incontext"><a class="internal" href="sec-Variance.html#def-variance">in-context</a></span>
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