12. A national corporation analyzed its overhead costs by state. It noticed that its Oklahoma offices had a mean monthly overhead cost of $37115 with a standard deviation of $2920. Its Texas office had a mean monthly overhead cost of $120850 with a standard deviation of $19400. Use the Coefficient of Variation to determine which state office had the most variation in its monthly overhead costs? 13. The Oklahoma office of a national corporation has a mean overhead cost of $37115 with a standard deviation of $2920. Use Chebyshev's Theorem to determine how often the overhead costs for this office were between $33319 and $4091 1 (within + 1.3 standard deviations of mean)? 14. The Oklahoma office of a national corporation has a mean overhead cost of $37115 with a standard deviation of $2920. Use Chebyshev's Theorem to determine in what range the monthly overhead costs of the Oklahoma office will fall 75% of the time