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    How many times do we have to flip a coin to have it being as close to its true mean of 50%?

    How many times do we have to flip a coin to have it being from its true mean of 50% with a reasonable margin of error say +/- 1%? We know that flipping a coin, very rarely (but it can happen), that we have 10 heads or tails in a row. So we definitely need a much larger sample, my guess is at...