gt; ## Iris virginica</span>
<span class="co">#&gt; </span>
<span class="co">#&gt; This species of flower is great! It has a mean sepal length of </span>
<span class="co">#&gt; `r mean(iris[iris$Species == "virginica", "Sepal.Length"])`, and </span>
<span class="co">#&gt; mean sepal width of `r mean(iris[iris$Species == "virginica", "Sepal.Width"])`. </span>
<span class="co">#&gt; That looks like this on a graph!</span>
<span class="co">#&gt; </span>
<span class="co">#&gt; ```{r}</span>
<span class="co">#&g