Advertising expenses are a significant component of the cost of goods sold. Listed below is a frequency distribution showing the advertising expenditures for 35 manufacturing companies. Estimate the mean, median, and standard deviation of advertising expense. (Round the final answers to 2 decimal places.)

Advertising Expenditure ($ millions)	Number of companies
$15 to under $25	2
25 to under 35	8
35 to under 45	11
45 to under 55	9
55 to under 65	5
Total	35

Mean

Median

Standard deviation