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Homework Help: Calulate chance to get x heads in y flips

  1. Oct 6, 2011 #1
    1. The problem statement, all variables and given/known data

    So if I wanted to get the chance to get x heads in y flips (x <= y)
    I use y choose x / 2^y right?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Oct 6, 2011 #2


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    Staff Emeritus
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    For a fair coin, yes.
  4. Oct 6, 2011 #3
    So the chance of getting 10 heads with 5 flips is 0.3125? ;-)
  5. Oct 6, 2011 #4


    Staff: Mentor

    See below.
  6. Oct 6, 2011 #5
    I win.
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