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Math Help - need help in probability!!!! please help me!!

  1. #1
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    Question need help in probability!!!! please help me!!

    A probabilistic experiment consists in rolling two un-biased dice, one painted red and
    one painted blue. You roll the dice and you record the numbers showing on each die.
    Let X be the random variable that records the number that you get by subtracting the
    value on the red die from the value of the blue die.
    (a) What is the probability distribution of X. (5 marks)
    (b) You play a game with Burkard. You roll the dice and get X Freddo Frogs if X is
    positive. If X is negative, you have to give Burkard −X Freddo frogs. Nothing
    happens if X = 0. What are your expected winnings in terms of Freddo Frogs?
    What is the standard deviation of this random variable? (5 marks)
    Last edited by sinyoungoh; September 2nd 2008 at 08:14 AM.
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  2. #2
    MHF Contributor
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    Th epossible outcomes are

    -5
    -4
    -3
    -2
    -1
    0
    1
    2
    3
    4
    5

    You tell me the probabiltiies of each. Just make a 6x6 grid and it should become clear very quickly.
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