Guess two thirds


You have an integer between 0 and 100. Winner is whoever comes closest to 2/3 of the average of all player's guesses.
Think for a minute, then choose a value.
Evaluations Number of players: 40 (in two sessions)
Mean guess: 23.75 ±29.4
Winner: 16
Distribution of guesses:
Notes Comments Usually the winner is close to 18 or 20 although equilibrium predicts 0. This means that if all players had been rational, all would have chosen zero.
Written by Christoph Hauert