# Math Help - random variable sets

1. ## random variable sets

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.

2. This sounds like the discrete version of Chebyshev's $\ne$