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Calculate coefficient of mean deviation about mean for the following data:

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Important Questions on Measures of Dispersion
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The marks obtained by students and in examinations are given below
Marks of | |||
Marks of |
The ratio of the coefficient of variation of marks of and the coefficient of variation of marks of is

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Calculate coefficient of mean deviation about mean for the following data:

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What are the requisites of a good measure of variation?

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Find the Coefficient of mean deviation from median of observations .

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