Mathematics, 16.10.2020 16:01 fatty18

A history class is made up of 12 tenth-graders and 9 eleventh-graders. The tenth-graders averaged 77 on the midterm exam and the eleventh-graders averaged 91. What was the average grade on the midterm exam for the entire class?

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A history class is made up of 12 tenth-graders and 9 eleventh-graders. The tenth-graders averaged 77...