A school evaluated final examination scores across two classes: Class A (30 students) had a mean score of 80 points; Class B (20 students) had a mean score of 90 points. What was the combined mean score across all 50 students?
Answer and explanation
Correct answer: C. 84 points
- Step 1: Calculate total points: points. Step 2. Divide by 50 students: points. Answer: 84 points. Why not the others: is the unweighted average , ignoring the larger size of Class A; and underestimate Class B's contribution.
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