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Math Help - Finding Probability

  1. #1
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    Finding Probability

    I am experiencing difficulties with the following problem. I don't know how to find the intersection probability of Pr(AnBcomplement). This is just for the first row. I found intersection of a and b which is 0.4, I also found A complement which is 0.3 and b complement which 0.4. Any help would be greatly appreciated.
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    Last edited by Solid8Snake; October 6th 2012 at 03:15 PM.
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  2. #2
    Junior Member MathTutor2013's Avatar
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    Re: Finding Probability

    Hi,

    Notation: B* = complement of B

    Remember that you can use: P(A) = P(A and B*) + P(A and B)

    For example for the first row:

    we know: Pr(A) = 0.7, Pr(B)=0.6 and Pr(AUB)=0.9

    P(AUB) = P(A)+P(B)-P(A and B)

    0.9 = 0.7+0.6 -P(A and B)

    P(A and B) = 0.4

    P(A and B*) = P(A)-P(A and B) = 0.7 - 0.4 = 0.3

    P(B and A*) = P(B)- P(B and A) = 0.6 -0.4 = 0.2

    Let me know if you need more help
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  3. #3
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    Re: Finding Probability

    Quote Originally Posted by Solid8Snake View Post
    I am experiencing difficulties with the following problem. I don't know how to find the intersection probability of Pr(AnBcomplement). This is just for the first row. I found intersection of a and b which is 0.4, I also found A complement which is 0.3 and b complement which 0.4. Any help would be greatly appreciated.
    That is a bad file. Word will not open it. Just type out your question.
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  4. #4
    Junior Member MathTutor2013's Avatar
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    Re: Finding Probability

    Did i help you ? (the file opens right)

    Thanks
    Thanks from Solid8Snake
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  5. #5
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    Re: Finding Probability

    Quote Originally Posted by MathTutor2013 View Post
    Did i help you ? (the file opens right)
    @MathTutor2013
    I take it from your screen name you fancy yourself a tutor for mathematics.
    Then why don't you bother to learn the standard mathematics protocol for mathematics type-setting LaTeX?
    Don't you think that P(A\cup B) = P(A)+P(B)-P(A\cap B) looks much more professional that P(AUB) = P(A)+P(B)-P(A and B)?

    That code is simple [TEX]P(A\cup B) = P(A)+P(B)-P(A\cap B)[/TEX].

    On the tool bar the \Sigma gives the [TEX] [/TEX] wrap.

    You can use this as a reference.
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  6. #6
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    Re: Finding Probability

    Thank you very much, it's all clear now.
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