class='no'>sex</span>, <span class='no'>island</span>) <span class='kw'>%&gt;%</span>
  <span class='fu'><a href='https://dplyr.tidyverse.org/reference/summarise.html'>summarise</a></span>(<span class='kw'>body_mass_g</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/mean.html'>mean</a></span>(<span class='no'>body_mass_g</span>, <span class='kw'>na.rm</span> <span class='kw'>=</span> <span class='fl'>TRUE</span>))</div><div class='output co'>#&gt; <span class='message'>`summ