A student scores 90 in an exam with weight 3 and 70 in an exam with weight 2. What is the weighted average?
Answer and explanation
Correct answer: D. 82
- Step 1: Weighted sum = 90 x 3 + 70 x 2 = 410. Step 2. Divide by 5: 82. Answer: 82. Why not the others: 80: the unweighted mean was used. 410: the sum was not divided by the total weight. 78: the weights were swapped.
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