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8. Calculate variance and standard deviation for the following data Marks 10 20 30 40 50 60 frequencies 8 12 20 10 7 3 9.

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8. Calculate variance and standard deviation for the following data Marks 10 20 30 40 50 60 frequencies 8 12 20 10 7 3 9. Calculate the median and mode from the following data Income : 0-99 100-199 200-299 300-399 400-499 500-599 No.of persons 10 18 25 12 8 3 10. Obtain Bowley's coefficients of skewness for the following data C.IT 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 fi 12 16 26 38 22 15 7 4

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