Advertising expenses are a significant component of the cost of goods sold. Listed below is a frequency distribution showing the advertising expenditures for 60 manufacturing companies. Estimate the mean, median, and standard deviation of advertising expense. (Round the final answers to 2 decimal places.) Advertising Expenditure Number of ($ millions) companies $30 to under $40 8 40 to under 50 12 50 to under 60 16 60 to under 70 14 70 to under 80 10 Total 60 Mean Median Standard deviation