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Assume the average age of an MBA student is 28.9 years old with a standard deviation of 2 2 years ") Determine the coefficient of variation, b) Calculate the z-score for an MBA student who is 23 years old c) Using the empirical rule, determine the range of ages that will include 68% of the students around the mean. d) Using Chebyshev's Theorem, determine the range of ages that will include at least 91% of the students around the mean. ") Using Chebyshev's Theorem, determine the range of ages that will include at least 86% of the students around the mean a) The coefficient of variation is 7.6% (Round to one decimal place as needed.) b) The z-score for an MBA student who is 23 years old is - 2.68 (Round to two decimal places as needed.) c) Using the empirical rule, the range of ages that will include 68% of the students around the mean, in interval notation, is (Round to one decimal place as needed )