On Wed, 9 Sep 1998 nateat_private wrote: > It is very easy. Assume that you have a standard deviation of 3 in the > sequence every 10 ms (Ivan Arce measured a stdev of 2.6942). This means > that a single guessed sequence of 499, 500, or 501 has a ~68% (1 stdev) > chance of being correct. Assuming you are guessing one every 10 ms, it > would only take 3 tries (30 ms) for you to have a better than 90% chance > of succeeding. Just as a point of order, ~68% would fall between 496 and 502, assuming a bell-shaped curve. Your numbers fell within a one-standard-deviation interval, and 68% fall within one standard deviation (plus or minus) of the mean (499, according to Ivan). Plus, I'd wonder if the distribution is truly bell-shaped. Regardless of this point, your argument is still valid. Chebysev's theorem tells us that at least 75% would fall within a 12-unit interval, which means that this is open to a not-so-brute force attack. Mark Gansle
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