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Find the median of the following data: ...

Find the median of the following data: CLASS ; 0-10 , 10-20 , 20-30 , `30-40 , 40-50 , `50-60 , 60-70 , 70-80 , 80-90 , `90-100 FREQUENCY ; 5 ,3 , 4 , 3 , 3 , 4 , 7 , 9 , 7 , 8

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