Here, we first grouped the data by origin and then calculated the summary statistics.

Calculate the median and interquartile range for arr$\_$delay s of flights in in the sfo$\_$feb$\_$flights data frame, grouped by carrier. Which carrier has the most variable arrival delays?

Departure del$$ys by month

Which month would you expect to have the highest average delay departing from an NYC airport?

Let's think about how you could answer this question:

First, calculate monthly averages for departure delays. With the new language you are learning, you could

group$\_$by months, then

summarise mean departure delays.

Then, you could to arrange these average delays in desc ending order