Many Football Bets Include a "Point-Spread" So That the Team

Many football bets include a "point-spread" so that the team that is favored needs to win by more than that amount for a "victory." The point-spreads are designed by professional odds makers with the intention that the probability of the favored team winning by the required amount is 0.50.
-In many, many football games, the favored team will win by the point-spread in about 50% of those games.