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Math Help - Probability problem

  1. #1
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    Red face Probability problem

    Hello, I need some help with one math problem:
    "There are TWO events, one of these events has probability 0,84. (nothing is said about other event ) What probability is to have 4 of 6 such events occured."
    As I imagine these events should happen in pairs [0,84, ???], [0,84, ???] and [0,84, ???].
    6 events, 3 probabilities unknown.
    any ideas?
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  2. #2
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    Quote Originally Posted by edvintas View Post
    Hello, I need some help with one math problem:
    "There are TWO events, one of these events has probability 0,84. (nothing is said about other event ) What probability is to have 4 of 6 such events occured."
    As I imagine these events should happen in pairs [0,84, ???], [0,84, ???] and [0,84, ???].
    6 events, 3 probabilities unknown.
    any ideas?
    Please post the whole question exactly as it's written. What you've posted makes no sense.
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  3. #3
    Senior Member Twig's Avatar
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    hi

    Hi

    As Mr.Fantastic said, you really should try to make your posts as clear as possible. Now I am just guessing what you mean here..

    You say you have TWO events,  A_{1} \mbox{ and } A_{2}
    If  P(A_{1}) = 0.84 \, \Rightarrow \, P(A_{2}) = 1-P(A_{1}) = 0.16

    If you mean chances of A_{1} happening 6 times in a row, then  (P(A_{1}))^{6} \approx 0.35

    This is also assuming that the probabilities remain constant etc.

    If you wonder what are the chances of for example  A_{1} occuring 4 times and  A_{2} occuring 2 times, IŽd recommend the Binomial formula.( Check wikipedia or search forum for more info on binomil distribution).

    Hope this helps a little..
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