A ping pong ball is drawn at random from an urn consisting of balls numbered...
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A ping pong ball is drawn at random from an urn consisting of balls numbered 2 through 10 A player wins 1 dollar if the number on the ball is odd and loses 1 dollar if the number is even What is the expected value of his winnings Express your answer in fraction form A card is drawn at random from a standard deck of playing cards no jokers If it is red the player wins 1 dollar if it is black the player loses 2 dollars Find the expected value of the game Express your answer in fraction form
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