How to Bet on a Game Three Finals

Kyle Bush beat Denny Hamlin in overtime. The average NFL team should be lined at eight and a half, right? Because it seems to win half the games. Not so a chance of ties only a 10 minute overtime period really is more than 8.44. How would you take all the league's wins by dividing them by number of teams? If you're not a long time listener, don't assume that I personally am going to make my bigger bets on one of those sides.