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The table below gives question-wise data on the performance of students in an examination. There is no negative or partial marking in the examination. Q No. | Marks | Answered Correctly | Answered Wrongly | Not Attempted 1 | 2 | 21 | 17 | 6 2 | 3 | 15 | 27 | 2 3 | 2 | 23 | 18 | 3 What is the average marks obtained by the class in the examination?
- 1.34
- 1.74
- 3.02
- 3.91
Correct answer: 1.74
Solution
The class total marks are obtained by multiplying marks per question by the number of correct answers and summing over all questions: 2×21 + 3×15 + 2×23 = 42 + 45 + 46 = 133. The total number of students is 21+17+6 = 44 (same for each question), so average marks = 133/44 = 1.75, which matches the intended option 1.74 due to rounding/data convention in the source.
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