basic probability

  1. H

    Thumbs Up or Down on my logic

    Very rusty on my statistics and will appreciate validation or correction on my thinking. "Fair" playing field - 88 players (18 in red shirts, 70 in green shirts ) - 22 winners. Probability no red shirt wins is (I hope): 66/88 * 65/87 * 64/86 ... 49/71 = 0.00283, i.e. (66!/48!) / ( 88!/70!)...
  2. B

    Binomial formula - solve for N help ...

    Hi, I'm not a student and this is not for a test. I'm a programmer and this is related to the markets. This is a link for the common formula: [URL="http://www.mathwords.com/b/binomial_probability_formula.htm"]http://www.mathwords.com/b/binomial_probability_formula.htm How would you change...
  3. C

    Coin Flip and calling randomly

    If there is a coin flip contest and there is a coin flipper continuously flipping the coin and there are three contestants 1. Always Calls Heads 2. Always Calls Tails 3. Calls randomly what is the percentage of right answers for each contestants and why. I think its 50% for always heads...