Aboard game is played as follows: a number cube numbered 1 to 6 is rolled. if the number 1 comes up, you get nothing. if the number 2, 3, or 5 comes up, you win 40 points. if the number 4 or 6 comes up, you lose 60 points. use the expected value to prove whether or not the game is fair. show all work for full credit.