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A school district compares two elementary schools. School A has 120 students with mean test score 78. School B has 80 students with mean test score 84. What is the overall mean test score for all 200 students?
A school district compares two elementary schools. School A has 120 students with mean test score 78. School B has 80 students with mean test score 84. What is the overall mean test score for all 200 students?