 the result, by default None.</p>
</dd>
</dl>
</section>
<section id="id42">
<h2>Returns<a class="headerlink" href="#id42" title="Link to this heading">¶</a></h2>
<dl class="simple">
<dt>float</dt><dd><p>Second moment of the probability distribution.</p>
</dd>
</dl>
</section>
</section>
<section id="getstdev">
<h1>getStDev<a class="headerlink" href="#getstdev" title="Link to this heading">¶</a></h1>
<p>Gets the standard deviation of the probability distribution.</p>
<section id="id43">
<h2>Parameters<a c