Advertising expenses are a significant component of the cost of goods sold. Listed below is a frequency distribution showing the advertising expenditures for 70 manufacturing companies located in the Southwest. The mean expense is $50.71 million and the standard deviation is $11.59 million. Is it reasonable to conclude the sample data are from a population that follows a normal probability distribution?
Advertising Expense Number ($ Million) of Companies 25 up to 35 7 35 up to 45 14 45 up to 55 25 55 up to 65 15 65 up to 75 9 Total 70
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