Update numbers.qmd (#1409)

* Update numbers.qmd

Some typos. Espeically, the unit of dep_delay is minute rather than hour.

* Update numbers.qmd

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Co-authored-by: Mine Cetinkaya-Rundel <cetinkaya.mine@gmail.com>

numbers.qmd

@@ -579,7 +579,7 @@ An alternative is to use the `median()`, which finds a value that lies in the "m
 Depending on the shape of the distribution of the variable you're interested in, mean or median might be a better measure of center.
 For example, for symmetric distributions we generally report the mean while for skewed distributions we usually report the median.
 
-@fig-mean-vs-median compares the mean vs. the median when looking at the hourly vs. median departure delay for each destination.
+@fig-mean-vs-median compares the mean vs. the median departure delay (in minutes) for each destination.
 The median delay is always smaller than the mean delay because flights sometimes leave multiple hours late, but never leave multiple hours early.
 
 ```{r}