Posted by denise on Thursday, June 23, 2011 at 11:52pm.
Use Chebyshev’s theorem to find what percent of the values will fall between 162 and 292 for a data set with a mean of 227 and standard deviation of 13.

math  drwls, Friday, June 24, 2011 at 7:06am
That is within 5 standard deviations or "sigmas" of the mean.
99.9997% are in that range, according to normal distribution tables. I am not familiar with your theorem