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Thread: probability

  1. #1 probability 
    Forum Ph.D. Heinsbergrelatz's Avatar
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    can anyone solve part (c)?

    A coin is weighted in such a way that there is a 70% chance of it landing heads. The coin is tossed three times in succession, find the probability:

    c)two heads given that at least one head shows up

    Also this is another question;

    how do you show that:


    thank you


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  3. #2 Re: probability 
    . DrRocket's Avatar
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    Quote Originally Posted by Heinsbergrelatz
    can anyone solve part (c)?
    yes


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  4. #3  
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    Use binomial to get probabilities for 0, 1, 2, 3 heads.

    Prob of at least 1 head = (P1+P2+P3)=A. You want P2/A for exactly 2 or (P2+P3)/A for at least 2.
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