Load the murdersdataset

1. Use as_tibble to convert the murders data table into a tibble and save it in an object called murders_tibble.

2. Use the group_by function to convert murders into a tibble that is grouped by region. Save in an object called murders_grouped.

3. Write tidyverse code that is equivalent to this code:

exp(mean(log(murders$population)))

and save the result in an object called pipe_output. Write it using the pipe so that each function is called without arguments. Use the dot operator to access the population. Hint: The code should start with pipe_output <- murders %>%.