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Thread: !HELP! in PROBABILITY Question! Please!

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    !HELP! in PROBABILITY Question! Please!




    A Level Statistics Question (Probability)

    Q. In a class, 25% of students are British and 55% are American. If 15% are both British & American, find the probability that a student picked at random is either British or American.

    [P.S. : Now, I have tried solving it using a Venn Diagram & Complimentry method which would become 1-neither American Nor British, but I'm not sure whether it's right or wrong. Desperately need help for this! Thank You!]

  2. #2
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    Isn't it like this?
    A: Americans
    B: British
    p(AuB)=p(A)+p(B)-p(AB)= 55+25-15
    This can be illustrated by Venn diagramm
    Good luck!

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