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Math Help - Probability question

  1. #1
    Senior Member Danneedshelp's Avatar
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    Probability question

    Q: Given a balanced spinner (like the kind you use for twister) divided into quarters, find the following probabilities...

    a) A={1/4}

    b) A=[\frac{1}{4},\frac{3}{8}]

    A:

    (a) P(A)=\empty

    (b) I am not sure how to do this one. I keep getting 32.5%, but that cant be.

    How do I do this systematically?

    Thank you
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  2. #2
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    mr fantastic's Avatar
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    Quote Originally Posted by Danneedshelp View Post
    Q: Given a balanced spinner (like the kind you use for twister) divided into quarters, find the following probabilities...

    a) A={1/4}

    b) A=[\frac{1}{4},\frac{3}{8}]

    A:

    (a) P(A)=\empty

    (b) I am not sure how to do this one. I keep getting 32.5%, but that cant be.

    How do I do this systematically?

    Thank you
    What is A meant to represent?
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  3. #3
    Senior Member Danneedshelp's Avatar
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    Quote Originally Posted by mr fantastic View Post
    What is A meant to represent?
    a) The probability of landing on 1/4 exactly

    b) The probability of landing within the given interval.
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  4. #4
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    Quote Originally Posted by Danneedshelp View Post
    a) The probability of landing on 1/4 exactly

    b) The probability of landing within the given interval.
    I still don't get it. From what you've said, surely Pr(A = 1/4) = 1/4. And Pr(1/4 < A < 3/8) = 3/8 - 1/4 = 1/8.
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