Data-Science Code Review

Joe,
I forked level_up_exercises and imported solutions that I had been placing in a different project. Going forward I will use this fork to submit pull-requests.

Zamir
there's probably some better way to do this directly from the array. using `.fetch`, or `.detect`, or `.max` or similar. I'm not 100% clear on what you're doing here, though. Also, this method is confusing :)