John has a deck of 10 cards numbered 1 through 10. He is playing a game of chance.This game is this: John chooses one card from the deck at random. He wins an amount of money equal to the value of the card if an odd numbered card is drawn. He loses $3.40 if an even numbered card is drawn.(If necessary, consult a list of formulas.)(a) Find the expected value of playing the game.dollars(b) What can John expect in the long run, after playing the game many times?(He replaces the card in the deck each time.)John can expect to gain money.Hecanexpecttowindollarsperdraw.John can expect to lose money.Hecanexpecttolosedollarsperdraw.John can expect to break even (neither gain nor lose money).
Question
John has a deck of 10 cards numbered 1 through 10. He is playing a game of chance.This game is this: John chooses one card from the deck at random. He wins an amount of money equal to the value of the card if an odd numbered card is drawn. He loses $3.40 if an even numbered card is drawn.(If necessary, consult a list of formulas.)(a) Find the expected value of playing the game.dollars(b) What can John expect in the long run, after playing the game many times?(He replaces the card in the deck each time.)John can expect to gain money.Hecanexpecttowindollarsperdraw.John can expect to lose money.Hecanexpecttolosedollarsperdraw.John can expect to break even (neither gain nor lose money).
Solution
To solve this problem, we first need to understand the concept of expected value in probability. The expected value is the average outcome of a random event if it were repeated many times.
(a) To find the expected value of playing the game, we need to multiply each outcome by its probability and then sum these products.
There are 10 cards, 5 of which are odd (1, 3, 5, 7, 9) and 5 of which are even (2, 4, 6, 8, 10).
The total value of the odd cards is 1+3+5+7+9 = 25. Since each card has an equal chance of being drawn, the expected value from drawing an odd card is 25/5 = $5.
The total value lost from drawing an even card is 3.40.
Since there's an equal chance of drawing an odd or even card, the overall expected value of the game is the average of these two expected values, which is (5 - 3.40)/2 = $0.80.
(b) In the long run, after playing the game many times, John can expect to gain an average of 0.80 per draw.
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