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    • Thread Starter

    Would some kind person take the time to help me with this question? I'm very stuck...

    Isobel plays football for a local team. Sometimes her parents attend matches to watch her play.

    A is the event that Isobel's parents watch a match

    B is the event that Isobel scores in a match

    You are given that P(B|A) = 3/7 and P(A) = 7/10

    (i) Calculate P(AnB)

    For this, I did: P(AnB)=7/10 x 3/7 =21/70

    Am I going about this correctly?

    How do I work out B for this? I tried to rearrange it and got 2.3 or something but I know this is wrong...

    I need to draw a venn diagram and I know the intersect is 0.3 but how do I work out the other two semi circles?...

    I put that B= 0.2

    It then asks me to say whether theyre independent and I've said that .7x.5 doesnt = .3 so theyre not independent..

    The next part of the question says:

    By comparing P(B|A) with P(B) explain why Isobel should ask her parents not to attend?? I have no idea..

    Could someone please please help me, im so stuck and I want to do well in S1 but I probably won't
    • Thread Starter


    (Original post by wednesday_adams)
    You'll get a better response in the maths forum.

    I've moved it for you.

    have you tried to draw a Venn Diagram ?
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Updated: December 3, 2014

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