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In an examination,60 candidates passed science or maths.if 15 passed both subjects and 9 more passed maths than science, find the number of people who passed maths and science, probability that a candidate passed exactly one subject.

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Jocelyn

  1. If x passed science. then x+9 passed math. Now you know that
    x + x+9 - 15 = 60
    x=33
    Then 18 passed only science, and 27 passed only math.
    So P(only one subject) = (18+27)/60 = 45/60 = 3/4

    That's the general way to solve this. Usually you have to figure out how many passed both (or all three, or whatever). In this case, there's a shorter way.
    60 passed something
    15 passed both, so
    60-15 = 45 passed only one.

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    oobleck

  2. So please what the percentage of candidates who passed exactly one subject

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    Blessing

  4. Yes

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    Simon

  5. good

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    unity

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