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In a card game Reena wins 3 Rs. if she draws a king or a spade and 7 Rs. if a heart or a queen from an pack of 52 playing cards. If she pays a certain amount of money each time she will lose the game. What will be the amount so that the game will come out a fair game?(a) 15(b) 6(c) 23(d) 2The question was posed to me in homework.I'd like to ask this question from Discrete Probability topic in section Discrete Probability of Discrete Mathematics

Answer»

The correct CHOICE is (d) 2

For explanation: We know that E(X) = ∑{xi * P(xi)} = 3 * \(\frac{2}{13} + 7 * \frac{2}{13} − x * \frac{10}{13} = \frac{20}{13} − \frac{10x}{13}\). Suppose the expected value should be 0 Rs. for the game to be fair. So \(\frac{20}{13} − \frac{10x}{13}\) = 0 ⇒ x=2. So she should pay Rs.2 for it to be a fair game.



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