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Math Help - help finding probability again,please let me know if I did it right

  1. #1
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    help finding probability again,please let me know if I did it right

    the question is
    you roll a die. find each probability
    A. rolling a 6 or a number greater then 4.
    B. Rolling a number less then 5 or an odd number
    c. rolling a 3 or an even number
    I think I have it right but would like you experts to help. thank you
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by mkcar View Post
    I think I have it right but would like you experts to help. thank you
    then tell us your solutions, so we know exactly which to help you with
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  3. #3
    Bar0n janvdl's Avatar
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    Quote Originally Posted by mkcar View Post
    the question is
    you roll a die. find each probability
    A. rolling a 6 or a number greater then 4.
    B. Rolling a number less then 5 or an odd number
    c. rolling a 3 or an even number
    I think I have it right but would like you experts to help. thank you
    For a)

    The chances of rolling a 6 are  \frac{1}{6} i think.

    Rolling a number greater than 4. It should be either 5 or 6 then, but we already have 6 so it will be only 5 that is left  \frac{1}{6}

    Add them together.

     \frac{1}{6} + \frac{1}{6} = \frac{2}{6} = \frac{1}{3}

    For b)

    Rolling a number less than 5. It should be 1;2;3 or 4 then, so it will be  \frac{4}{6}

    An odd number. It should be 1;3 or 5 then, but we already have 1 and 3. Only 5 remains, so it will be  \frac{1}{6}

    Add them together.

     \frac{4}{6} + \frac{1}{6} = \frac{5}{6}

    For c)

    The chances of rolling a 3 are  \frac{1}{6}

    An even number. It should be 2;4 or 6 then, so it will be  \frac{3}{6}

    Add them together.

     \frac{1}{6} + \frac{3}{6} = \frac{4}{6} = \frac{2}{3}


    Quote Originally Posted by mkcar
    I think I have it right but would like you experts to help...
    That's not me. Probability isnt my strong point. Jhevon helped me, so give him credit... I made mistakes.
    Last edited by janvdl; July 8th 2007 at 12:51 PM.
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  4. #4
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    Thank you, I had a part wrong

    thank you all for your help I had a part wrong.
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