12. You are given the following data pertaining to kilowatt hours of electricity consumed by 100 persons in J&K. Consumption (in K Watt hours) 0-10 10-20 20-30 30-40 40-50 No. of users 6. 25 36 20 13 Calculate (i) arithmetic mean, (ii) standard deviation and (iii) coefficient of skewness.

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