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Math Help - Statistics Help Please

  1. #1
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    Statistics Help Please

    A garage knows that they have three charged and two dead batteries placed together by mistake. The random variable X is the number of batteries that have to be tested before all batteries are correctly identified as dead or charged.

    I have constructed a tree diagram of (Correctly identfied and not correctly identified) but i don't know whether this right step in solving the question. Also, I dont know what values to put in for the probability.

    [After it, I also need to the a table for the probablity function of x..but i dont know how]
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  2. #2
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    Re: Statistics Help Please

    Try it along these lines. X could be 2. That is if our first two picks were the dead ones. This probability would be (2/5)*(1/4)
    X could be 3 Example CDD (but there are other ways) X could be 4 Example CDCC (but again there are other ways)
    Try and list all the ways X could be 3 or 4 and work out the probability of each.
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