[FoRK] Coin flips not random

Jim Whitehead ejw at cs.ucsc.edu
Tue Nov 3 01:26:32 PST 2009


Heads or tails? It depends on how you flip it
By Jon Wilner and Mark Emmons
Mercury News

But first, here's what the researchers concluded: Using a high-speed 
camera that photographed people flipping coins, the three researchers 
determined that a coin is more likely to land facing the same side on 
which it started. If tails is facing up when the coin is perched on your 
thumb, it is more likely to land tails up.

How much more likely? At least 51 percent of the time, the researchers 
claim, and possibly as much as 55 percent to 60 percent — depending on 
the flipping motion of the individual.

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