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Math Help - probability using variables.

  1. #1
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    probability using variables.

    at a crime scene, even if a genetic prfoile of dna matchup conviction is not guarenteed.
    only 597 of 3000 matches led to convictions. Suppose 40 new dna matches which are selected at random and that the probability of a conviction in each case is 597/3000.

    so what is the probability of at most five convictions.

    and the probability of between four and eight convictions?

    then if there were 14 of the 40 matches that lead to convictions. is there any evidence to suggest the probability of a conviction has increased??

    thanks for any help with this, i've tried to set these up, and i still can't seem to get them right.

    ...i've changed the wording around to make it more easier to read, sorry about that.
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  2. #2
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    That can't be the actual question. Can you type the question as it is verbatim from your book?
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  3. #3
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    i fixed it a bit, hopefully easier to read now,

    still would like help though please.
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  4. #4
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    Not to harp, but the question is still confusing the way it's written - as theres no way this is the setup of the problem EXACTLY as it is written in your book, or in your notes.

    In anycase it SOUNDS like you have a binomial distribution where X~Bin(40,[597/3000]). Do you know how to solve this type of problem, and why you would use this formula (assuming the problem is written, and interpreted, correctly).
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