Grouped Data: Business Administration What are the big corporations doing with their wealth? One way to answer this question is to examine profi ts as percentage of assets. A random sample of 50 Fortune 500 companies gave the following information (Source: Based on information from Fortune 500, Vol. 135, No. 8).

Estimate the sample mean, sample variance, and sample standard deviation for profi t as percentage of assets.

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Profit as percentage of assets Number of companies 8.6-12.5 12.6-16.5 16.6-20.5 20.6-24.5 24.6-28.5 15 20 5 7 3