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Math Help - Probability

  1. #1
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    Probability

    Hi again
    This one is kind of tough. If anybody have a clue please let me know
    Probability-prob-46.jpg
    Thanks
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by mauro21pl View Post
    Hi again
    This one is kind of tough. If anybody have a clue please let me know
    Click image for larger version. 

Name:	Prob 46.jpg 
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    Thanks
    the proportion of people that have accidents in a fixed year is the sum
    of the proportion in each category times the probability of accident in a year for that category:

    In this case this is:

    0.2*0.05+0.5*0.15+0.3*0.3 = 0.175

    For the second part we can use Bayes' theorem:

    P(good|no accidents) = P(no accidents|good)P(good)/P(no accidents)

    ..........................= (1-0.05)*0.2/(1-0.175) = 0.230

    RonL
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