The movielens dataset also includes a time stamp. This variable represents the time and data in which the rating was provided. The units are seconds since January 1, 1970. Create a new column date...

The movielens dataset also includes a time stamp. This variable represents the time and data in which the rating was provided. The units are seconds since January 1, 1970. Create a new column date with the date. Hint: use the as_datetime function in the lubridate package.

Compute the average rating for each week and plot this average against day. Hint: use the round_date function before you group_by