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Mathematics, 16.10.2020 04:01 plum65

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?
A. 82
B. 83
C. 84
D. 85

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