Find the median of the following data: ...

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

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