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Politics : Formerly About Advanced Micro Devices

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To: jcholewa who wrote (128089)	11/10/2000 4:53:20 PM
From: pgerassi	Read Replies (2) of 1571204

Dear JC: You are somewhat right, but the example is wrong in that n = 4 not 3! The exact formula for the probability of x number of heads over n tosses is (x!(n-x)!)/(2^n). For more general case of at least x heads, it is the sum from j=x to n of (j!(n-j)!)/(2^n). However, the result comes very close to a Gaussian (Normal) distribution for large n where the mean m is n/2 and the standard deviation is about sqrt(n)/2 or 22.4. I am not at home, otherwise it would be easy to look it up (the exact term for the coin toss distribution curve is a "Binomial Distribution"). I hope this clears it up (Way OT). Pete

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