lass="n">midpoint</span><span class="w"> </span><span class="n">of</span><span class="w"> </span><span class="n">that</span><span class="w"> </span><span class="k">class</span><span class="o">.</span>

<span class="n">the</span><span class="w"> </span><span class="n">sample</span><span class="w"> </span><span class="n">minimum</span><span class="w"> </span><span class="ow">and</span><span class="w"> </span><span class="n">sample</span><span class="w"> </span><span class="n">maximum</span><span class="w"> </