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In the game of​ roulette, a player can place a ​$8 bet on the number 9...

In the game of​ roulette, a player can place a ​$8 bet on the number 9 and have a 1/ 38 probability of winning. If the metal ball lands on 9​, the player gets to keep the ​$8 paid to play the game and the player is awarded an additional ​$280. ​Otherwise, the player is awarded nothing and the casino takes the​ player's ​$8. Find the expected value​ E(x) to the player for one play of the game. If x is the gain to a player in a game of​ chance, then​ E(x) is usually negative. This value gives the average amount per game the player can expect to lose.

The expected value is : ​$

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