Exercise

Bonus: Visualizing every president's approval

In this exercise, you will create and graph a moving of approval ratings for all the presidents since the early 1900s.

The zoo, dplyr, and ggplot packages have already been loaded for you.

Instructions

100 XP

Use the rollmean() function from the zoo package to average each president's approval rating, stored in the Approve variable.
Add a geom_line layer to the plot.