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Math Help - simple probablility ques.

  1. #1
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    simple probablility ques.

    300 discs of different colour.
    100 pink, 100 blue and 100 orange.
    each is numbered from 0-99
    5 discs are selected at random. one and a time, with replacement.
    what is the probability of getting exact 2 orange disc that ends with a 6?
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  2. #2
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    i got 0.00984 and my friend got 0.00729
    but no right answer yet. please help
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  3. #3
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    Quote Originally Posted by z1llch View Post
    300 discs of different colour.
    100 pink, 100 blue and 100 orange.
    each is numbered from 0-99
    5 discs are selected at random. one and a time, with replacement.
    what is the probability of getting exact 2 orange disc that ends with a 6?
    X ~ Binomial(p = 10/300, n = 5)

    Calculate Pr(X = 2).
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  4. #4
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    alright thanks! =)
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