l*******l
发帖数: 248 | 1 We toss a fair coin 100 times, what is the probability that the number of
occurance of heads is less than 40? | x********9
发帖数: 31 | 2 You might approximate the binomial by a Gaussian. The variance is 25, so the
standard deviation is 5. So -2*\sigma is approcimatively the 47% quantile | k***n
发帖数: 997 | 3 (C^0_100+C^1_100+...+C^39_100) / 2^100? | m*********g
发帖数: 646 | 4 if it is a quick question, ~=2.5%, by CLT.
【在 l*******l 的大作中提到】
: We toss a fair coin 100 times, what is the probability that the number of
: occurance of heads is less than 40?
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