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A study of 100 engineering companies gives the following information. Calculate the standard deviation of the profit earned. Profit (Cr) Number 0-10 10-20 20-30

A study of 100 engineering companies gives the following information. Calculate the standard deviation of the profit earned. Profit (Cr) Number 0-10 10-20 20-30 30-40 40-50 50-60 of 8 12 20 30 20 10 Companies

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