span class="number">0.1</span><span class="special">;</span>
<span class="keyword">double</span> <span class="identifier">x</span> <span class="special">=</span> <span class="number">2.9</span><span class="special">;</span> <span class="comment">// Our required limit.</span>
<span class="comment">// then probability p = N((x - mean) / sd)</span>
<span class="comment">// So if we want to find the standard deviation that would be required to meet this limit,</span>
<span class="comment">// so that the p th qu