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10 students-girls & boys are in a line

  1. Sep 25, 2011 #1
    10 students--girls & boys are in a line....

    Hello

    There are 10 students--girls and boys--in a line.
    What is probability of p-th student is girl.
    {p=1,...10}

    Thanks for your attention in advance.
     
  2. jcsd
  3. Sep 25, 2011 #2

    HallsofIvy

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    Re: 10 students--girls & boys are in a line....

    There is no way to answer that without further information. If there are five boys and five girls, the probability that any one student, in any position in line, is a girl is 1/2, of course. But if the 10 students consist of seven boys and three girls,it is 3/10. The position doesn't matter. If x of the 10 students are girls, then the probability that any specific place in line is filled by a girl is x/10.
     
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