 for example,
            in <a href="http://en.wikipedia.org/wiki/Standard_deviation" target="_top">standard
            deviation</a>:
          </p>
<pre class="programlisting">Fraction 1 standard deviation within either side of mean is 0.683
Fraction 2 standard deviations within either side of mean is 0.954
Fraction 3 standard deviations within either side of mean is 0.997
</pre>
<p>
            We could of course get some really accurate values for these <a href="http://en.wikipedia.org/wiki/Confidence