My Math Forum Help with Probability

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 May 18th, 2009, 11:08 AM #1 Newbie   Joined: May 2009 Posts: 15 Thanks: 0 Help with Probability Can someone please look over the small chart I made that describes the probability game I made up and tell me if it's correct? In my game, the player picks three cards from a deck, placing each one to the side as they are chosen. If all three cards are the same colour, they win a certain amount of money. If the cards are any other combinatrion of red and black, they win nothing. P(x) is probability, and ? XP(x) is the expected winnings on average. Does this make sense? Please help!
May 18th, 2009, 04:45 PM   #2
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Re: Help with Probability

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 Originally Posted by mintsharpie Can someone please look over the small chart I made that describes the probability game I made up and tell me if it's correct? In my game, the player picks three cards from a deck, placing each one to the side as they are chosen. If all three cards are the same colour, they win a certain amount of money. If the cards are any other combinatrion of red and black, they win nothing. P(x) is probability, and ? XP(x) is the expected winnings on average. Does this make sense? Please help!
What is the meaning of X? You give it a value of 7. What is that?
What is x? You have defined it to mean 3 red cards, 3 black cards, or either event?

 May 19th, 2009, 06:22 AM #3 Newbie   Joined: May 2009 Posts: 15 Thanks: 0 Re: Help with Probability X is the amount of money the player wins if they get three red or three black cards.
 May 20th, 2009, 05:09 PM #4 Global Moderator   Joined: May 2007 Posts: 6,684 Thanks: 658 Re: Help with Probability Your calculation of expected return on a bet is correct, although to be fair you need to subtract the cost of the bet.
 May 23rd, 2009, 02:42 AM #5 Global Moderator   Joined: Dec 2006 Posts: 20,281 Thanks: 1965 The probability that the second and third cards match the first is (25/51)(24/50), i.e., 4/17, so the expected return is 28/17. You don't need a chart for that and don't need to calculate anything to nine decimal places.

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