Data obtained from a county auditor in the Excel file Home Market Value provides information about the age, square footage, and current market value of houses along one street in a particular subdivision. a. Considering these data as a sample of homeown- ers on this street, compute the mean, variance, and standard deviation for each of these variables using formulas (4.2), (4.5), and (4.7). Verify your calculations using the appropriate Excel function. b. Compute the coefficient of variation for each variable. Which has the least and greatest relative dispersion?