The co-efficient of variation along with its interpretation is:   Interval Frequency[f] Cumulative Frequency Midpoint[X] X2 fX FX2 0 < 20 7 7 10 100 70 700 20< 40 9 16 30 900 270 8100 40 <60 15 31 50 2500 750 37500 60 < 80 6 37 70 4900 420 29400 80 < 100 3 40 90 8100 270 24300 total 40     16500 1780 100000

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