making probabilistic predictions

Fivethirtyeight.com has an online prediction game for the 2017 NFL season:¬†https://projects.fivethirtyeight.com/nfl-predictions-game/ . Participants make a probabilistic prediction for each game (e.g., Cincinnati has a 59 percent chance of winning against Indianapolis), and after the game has been played, the prediction is scored using Brier scores that are adapted to a -75 to +25 scale. (So …