Two spectators who are watching the softball player decide to set up a bet between themselves. Spectator A believes that the next time the player is successful at getting three hits in her six attempts that it will only take 3 or 4 attempts, and spectator B believes that it will take 5 or 6 attempts. The spectators have agreed that spectator A will receive $20 if she is correct. Based on the observed relative frequencies of X, how much should spectator B receive to ensure this is a fair bet? A fair bet is one in which both parties have zero expected winnings.