class="external-link">dplyr</a></span><span class="op">)</span></span>
<span></span>
<span><span class="va">iris_densities</span> <span class="op">&lt;-</span> <span class="va">iris</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html" class="external-link">%&gt;%</a></span></span>
<span>  <span class="fu"><a href="https://dplyr.tidyverse.org/reference/group_by.html" class="external-link">group_by</a></span><span class="op">(</span><span class="va">Species</span><span class="o