">=</span> <span class="number">1000.</span><span class="special">;</span>
</pre>
<p>
            The we can use the Cumulative distribution function to predict fractions
            (or percentages, if * 100) that will last various lifetimes.
          </p>
<pre class="programlisting"><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"Fraction of bulbs that will last at best (&lt;=) "</span> <span class="comment">// P(X &lt;= 1000)</span>
  <span class="special