an class="o">.</span>

<span class="n">the</span><span class="w"> </span><span class="n">first</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="n">interval</span><span class="w"> </span><span class="k">is</span><span class="w"> </span><span class="n">from</span><span class="w"> </span><span class="n">the</span><span class="w"> </span><span class="n">sample</span><span class="w"> </span><span class="nb">min</span><span class="w"> </span><span class="n">to</span><