Standard Deviation
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Law of Large Numbers in Gambling: What It Really Means
What the law of large numbers says about gambling: averages settle on the house edge while totals swing wider, with roulette and coin-flip math.
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Variance in Gambling: Standard Deviation and Swings
How variance and standard deviation measure gambling swings, with roulette examples, the square-root-of-n rule and a table of session ranges.