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Advertising expenses are a significant component of the cost of goods sold. Listed below is a...

Advertising expenses are a significant component of the cost of goods sold. Listed below is a frequency distribution showing the advertising expenditures for 40 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
$30 to under $40 6
40 to under 50 9
50 to under 60 12
60 to under 70 9
70 to under 80 4
Total 40

Mean ?   

Median ?   

Standard deviation ?

Math   Statistics-And-Probability   
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