Three courses have average marks of 60, 75 and 85, with credit weights 1, 2 and 2. What is the weighted mean mark?
Answer and explanation
Correct answer: B. 76
- Step 1: Weighted total = 60 x 1 + 75 x 2 + 85 x 2 = 380. Step 2. Weighted mean = 380 / 5 = 76. Answer: 76. Why not the others: 73.33: That is the simple mean, which ignores the weights. 366.67: That multiplies the total of the marks by the total of the weights and divides by 3. 126.67: That divides the weighted total by the number of courses instead of the total weight.
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