Assume the average age of an MBA student is 30.6 years old with a standard deviation of 2.7 years. a) Determine the coefficient of variation. b) Calculate the z-score for an MBA student who is 27 years old. c) Using the empirical rule, determine the range of ages that will include 95% 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 mea e) Using Chebyshev's Theorem, determine the range of ages that will include at least 82% of the students around the meam a) The coefficient of variation is % (Round to one decimal place as needed.)