unctions inside functions

You already know that R functions return objects that you can then use somewhere else. This makes it easy to use functions inside functions, as you've seen before:

speed $<-31$

print$($paste$("$Your speed is$",$ speed$))$

Notice that both the print$()$ and paste$()$ functions use the ellipsis $-...-$ as an argument. Can you figure out how they're used?

Instructions

$100$ XP

Use abs$()$ on linkedin $-$ facebook to get the absolute differences between the daily LinkedIn and Facebook profile views. Place the call to abs$()$ inside mean$()$ to calculate the Mean Absolute Deviation. In the mean$()$ call, make sure to specify na$.$rm to treat missing values correctly!