dd>the arithmetic mean of all recorded durations</dd></dl>
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<h4>getStdDev</h4>
<pre>public&nbsp;double&nbsp;getStdDev()</pre>
<div class="block">Returns the standard deviation of all recorded durations.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the standard deviation of all recorded durations</dd></dl>
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