1. For the Excel file Surface Finish, identify each of the variables as categorical, ordinal, interval, and ratio. 2. Consider the data given in the Excel file MBA student survey, and look at the variable Undergraduate Concentration. a. Construct a column a chart that visually represents the frequencies of each of the undergraduate concentrations. b. Consider a pie chart showing the proportion of individuals in each concentration. 3. Construct a column chart for the data in the Excel file Restaurant Sales to allow a comparison of the delivery sales with the lunch sales and dinner sales. What other charts may be used to display this information?