The following table relates to the profits and losses of 100 firms. Calculate the average profits and the standard deviation of profits. Profits Number of Firms Profits Number of Firms 5000 to 6000 8. 4000 to 5000 12 3000 to 4000 30 2000 to 3000 10 1000 to 2000 0 to 1000 5 - 1000 to 0 6. - 2000 to 1000 8 -3000 to 2000 9. - 4000 to 3000 7

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