 </span><span class="nx">exponential</span><span class="w"> </span><span class="nx">distribution</span><span class="w"> </span><span class="nx">used</span><span class="w"> </span><span class="nx">herein</span><span class="w"> </span><span class="nx">has</span><span class="w"> </span><span class="nx">mean</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="k">and</span>
<span class="nx">standard</span><span class="w"> </s