It's a really nice question! It lends itself to starting with simple answers and gradually building up to a more elaborate and more precise answer. Even absent

It's a really nice question! It lends itself to starting with simple answers and gradually building up to a more elaborate and more precise answer. Even absent any stats knowledge you should be able to pledge at least 99 cents per roll, as you're always getting at least a dollar back, right? Woo! I'm winning already! :) I'm surprised people are having trouble even getting started. Perhaps the interview setting is intimidating? You should run a couple of friends-of-friends through it, and then ask your friends how the subjects felt.