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Math Help - Probability

  1. #1
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    Probability

    Hallo
    Another problem. Can you do this?

    Probability-picture.jpg

    Thank you
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by mauro21pl View Post
    Hallo
    Another problem. Can you do this?

    Click image for larger version. 

Name:	Picture.jpg 
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ID:	1748

    Thank you
    Use Bayes' theorem, let a denote the sudent from A and b the sudent from B:

    P(A is sup| a fair & b poor)=P(a fair & b poor|A is sup) P(A is sup)/P(a fair & b poor)

    ...............=(10/30 15/30)(0.5)/[(10/30 15/30)0.5 + (10/30 5/30)0.5]

    ...............~=0.083333/[0.083333+0.027778]~=0.75

    (Check the calculations please)

    RonL
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