What are the big corporations doing with their wealth? One way to answer this question is to examine profits 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 profit as percentage of assets. (Enter your answers to one decimal place.)
Profit as percentage of assets | 8.6-12.5 | 12.6-16.5 | 16.6-20.5 | 20.6-24.5 | 24.6-28.5 |
Number of companies | 11 | 16 | 4 | 7 | 12 |
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