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2. Calculate the mean, quartile deviation, variance and standard deviation for the following frequency distribution, and hence obtain the value of co-efficient of variation. Size

2. Calculate the mean, quartile deviation, variance and standard deviation for the following frequency distribution, and hence obtain the value of co-efficient of variation. Size (x) : 1 2 3 4 5 6 7 8 Frequency (f): 5 18 7 12 28 20 10 7

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