</span> 15              50        999    student     0.9971990         0.02153827</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 16              50         49 percentile     0.9000000         0.03642157</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 17              50         99 percentile     0.9350000         0.02928571</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 18              50        149 percentile     0.9400000         0.03077237</span>
<span class="r-