> and <code>w</code>.</p>
<p>The weighted standard deviation is calculated as</p>
<p><math display="block" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mfrac><mrow><munder><mo>∑</mo><mi>i</mi></munder><mrow><mo stretchy="true" form="prefix">(</mo><msub><mi>w</mi><mi>i</mi></msub><mo>*</mo><msup><mrow><mo stretchy="true" form="prefix">(</mo><msub><mi>x</mi><mi>i</mi></msub><mo>−</mo><msub><mover><mi>x</mi><mo accent="true">‾</mo></mover><mi>w</mi></msub><mo stretchy="true" form="postfix">)</m