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Three classes have means of 75, 80, and 85 with sizes of 30, 40, and 50 students. What is the overall mean?
Three classes have means of 75, 80, and 85 with sizes of 30, 40, and 50 students. What is the overall mean?
Three classes have means of 75, 80, and 85 with sizes of 30, 40, and 50 students. What is the overall mean?