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Message: [QUOTE="Matt Vaughan, post: 2042620, member: 34747"] Solid posts itt... :rolleyes: The standard deviation on that sample size is about 10.6, and your number of overpairs holding up will only be within one standard deviation of the mean about 68% of the time. For the sake of argument let's say the mean is 1/2 of the "coin flip" situations, so 56.5. 68% of the time, the outcome will be within one standard deviation, or 45.9 < # of times pairs hold up < 67.1 So you'll note that the deviation of your sample from the mean isn't unexpected. [/QUOTE]