.rm <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span>,</span>
<span>  delay <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/mean.html" class="external-link">mean</a></span><span class="op">(</span><span class="va">arr_delay</span>, na.rm <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span><span class="op">)</span></span>
<span><span class="va">delay</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://dplyr