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Math Help - [SOLVED] Probability

  1. #1
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    [SOLVED] Probability

    A list of numbers consists of p positive and n negative numbers. If a number is picked at random from this list, the probability that the number is positive is (3/5). What is the value of (n/p)?

    a) 3/8
    b) 5/8
    c) 2/3
    d) 3/2
    e) 8/3

    What is the correct answer and can you please explain why? Thanks in advance

    - - - -521
    Last edited by fabxx; September 25th 2008 at 10:58 PM.
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  2. #2
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    Quote Originally Posted by fabxx View Post
    A list of numbers consists of p positive and n negative numbers. If a number is picked at random from this list, the probability that the number is positive is (3/5). What is the value of (n/p)?

    a) 3/8
    b) 5/8
    c) 2/3
    d) 3/2
    e) 8/3

    What is the correct answer and can you please explain why? Thanks in advance

    - - - -521
    \frac{p}{p+n} = \frac{3}{5} \Rightarrow \frac{\frac{p}{n}}{\frac{p}{n} + 1} = \frac{3}{5} \, ....
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    Quote Originally Posted by mr fantastic View Post
    \frac{p}{p+n} = \frac{3}{5} \Rightarrow \frac{\frac{p}{n}}{\frac{p}{n} + 1} = \frac{3}{5} \, ....
    Why \frac{p}{p+n} = \frac{3}{5} ? Thanks
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  4. #4
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    Quote Originally Posted by fabxx View Post
    Why [tex]\frac{p}{p+n} = \frac{3}{5} ? Thanks
    Number of positive numbers divided by the total number of positive and negative numbers.
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