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Thread: Kyla's Test

  1. November 16th 2008, 09:43 PM #1
    magentarita
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    Kyla's Test

    The probability that Kyla will score above a 90 on a mathematics test is . What is the probability that she will score above a 90 on three of the four tests this quarter?
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  2. November 16th 2008, 10:46 PM #2
    mr fantastic
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    Quote Originally Posted by magentarita View Post
    The probability that Kyla will score above a 90 on a mathematics test is p . What is the probability that she will score above a 90 on three of the four tests this quarter?
    A necessary piece of information is missing. The red p marks the spot.

    The answer will be {4 \choose 3} p^3 (1 - p) = 4 p^3 (1 - p) where p is the value you haven't given.
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  3. November 17th 2008, 10:15 PM #3
    magentarita
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    ok............

    Quote Originally Posted by mr fantastic View Post
    A necessary piece of information is missing. The red p marks the spot.

    The answer will be {4 \choose 3} p^3 (1 - p) = 4 p^3 (1 - p) where p is the value you haven't given.
    Thank you very much.
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