A student's marks in three subjects are 60, 70 and 80. If the subjects carry weights of 20%, 30% and 50%, respectively, what is the weighted mean?
Correct answer: C. 73
- A. 70
- B. 72
- C. 73
- D. 75
Explanation
The weighted mean is calculated as 60(0.20) + 70(0.30) + 80(0.50). This gives 12 + 21 + 40 = 73, unlike the simple mean, which gives equal importance to every subject.
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