_interval" target="_top">confidence
            intervals</a> by using cout.precision(15);
          </p>
<pre class="programlisting">Fraction 1 standard deviation within either side of mean is 0.682689492137086
Fraction 2 standard deviations within either side of mean is 0.954499736103642
Fraction 3 standard deviations within either side of mean is 0.997300203936740
</pre>
<p>
            But before you get too excited about this impressive precision, don't
            forget that the <span class="bold"><s