for any set of real numbers x1, x2,...xn, show that the fraction of x1,...xn included in the interval (x(bar)-ks, x(bar)+ks) for k>=1, is at least 1-1/k^2. Here x(bar) is the sample mean and s is the sample standard deviation.
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This sounds like the discrete version of Chebyshev's $\displaystyle \ne$
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