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A Coin Game (Posted on 2004-05-20) Difficulty: 3 of 5
Alex flips a fair coin 20 times. Bert spins a fair coin 21 times. Bert wins if he gets more heads than Alex, else Alex wins. Note that Alex wins if there is a tie. What is the probability that Bert wins?

See The Solution Submitted by Brian Smith    
Rating: 3.5000 (4 votes)

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Probability under a microscope | Comment 8 of 12 |

A recent study at (Yale? Harvard? some East Coast college) confirmed that, in a controlled environment, with a machine that can flip a nickel the exact same way every time, heads came up 50.1% of the time and tails 49.9%.

Don't worry, though.  At most coin-flipping places the grass screws up all the figures, so it's not significant enough a difference to matter.


  Posted by Carlos Da Peanut on 2004-05-27 22:20:09
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