Sixty Sigma
Chebyshev's Inequality
A neglected fact is that a standard deviation provides a bound on the probability of samples lying away from the mean independent of the distribution. That is to say, you do not need to assume a normal distribution to say 75% of the samples lay within two standard deviations from the mean.
So...
When you see 60 black swans in the same pond, run!
Today is . Last modified: June 13, 2021.