Tuesday, August 4, 2009

Coin Flip Odds Actually 51-49 (Not 50-50)

When flipping a coin, the odds of it landing on either side are not 50-50 as is generally assumed. This has nothing to do with the odds of the coin landing on its side which I have seen happen a few times. That possibility does not come up in the article. The relative weight difference, if any, of the sides also does not matter. What comes into play is the law of mechanics. The chance of a coin landing facing the same direction they start are 51%. That means the odds on any given flip are actually 51-49, not 50-50.

http://www.washingtonpost.com/wp-dyn/content/article/2009/07/31/AR2009073104170.html

"Yet recent research into coin flips has discovered that the laws of mechanics determine the outcome of coin tosses: The startling finding is that they aren't random. Instead, for natural flips, the chance of a coin landing in the same position as it started is about 51 percent. Heads facing up predicts heads; tails predicts tails."
Posted by Andrew Berman at 8/04/2009 01:31:00 PM
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