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Find Coefficient of variation and Median for the following frequency distribution showing marks obtained by 100 students at a certain examination. Marks No. of students

Find Coefficient of variation and Median for the following frequency distribution showing marks obtained by 100 students at a certain examination.

Marks No. of students 30-39 40-49 3 50-59 11 60-69 20 70-79 32 80-89 25 90-99 7

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