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Math Help - probability

  1. #1
    bay
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    probability

    A bag of marbles contains two colours: red and blue. Two marbles are drawn from the bag and colors are recorded. This experiment is performed 12 times. Determine the approximate probability that 2 red marbles are drawn from the bag

    My answer: the probability is 6
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by bay View Post
    A bag of marbles contains two colours: red and blue. Two marbles are drawn from the bag and colors are recorded. This experiment is performed 12 times. Determine the approximate probability that 2 red marbles are drawn from the bag

    My answer: the probability is 6
    just the nature of your answer should tell you that it's incorrect. you can't have a probability greater than 1. now the chart tells you the frequency of choosing the different combinations: 2 reds, 1 red 1 blue, or 2 blues. Note that all these frequencies add up to 12. now the chart says that the frequency of choosing 2 red marbles is 6. it means out of 12 trials, we would get 2 red marbles approximately 6 out of those 12 times we do the experiment. so now, what do you think the probability is?
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  3. #3
    bay
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    well...

    I see now that you pointed it out it was a dumb mistake and i belive the the probablitiy is 1/2 = 0.5
    Is this correct?
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by bay View Post
    I see now that you pointed it out it was a dumb mistake and i belive the the probablitiy is 1/2 = 0.5
    Is this correct?
    correct, it is 6/12 = 1/2 = 0.5
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