OK, so here's the question (not my homework - which is line segments -_-)
According to Chebyshev's theorem, how many standard deviations from the mean would make up the central 60% of scores for this class? [What are the corresponding grades? Answer the same questions for central 80%. Do these values capture more than the desired amount? Does this agree with Chebyshev's theorem?]
(The stuff in brackets doesn't need to be answered. I included it there just in case.)
Thanks in advance.