Rust Program: Mean, Median & Mode

Continuing with "The Rust Programming Language", this video goes over the first homework assignment given in Chapter 8.3.

"Given a list of integers, use a vector and return the mean (the average value), median (when sorted, the value in the middle position), and mode (the value that occurs most often; a hash map will be helpful here) of the list." ... https://www.youtube.com/watch?v=FC-zZ-dzxwg