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Listen Grades 50-60 60-70 70-80 80-90 90-100 No. of Students 5 2 11 6 3 Calculate the mean of the sample grouped data above. 1

Listen Grades 50-60 60-70 70-80 80-90 90-100 No. of Students 5 2 11 6 3 Calculate the mean of the sample grouped data above. 1 73 76.48 ) 74.50

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