Multiple choice

A student obtained 60, 75 and 85 marks in three monthly examinations and 95 marks in the final examination in Physics. The three monthly examinations are of equal weightage, whereas the final examination is weighted twice as much as a monthly examination. What are the average marks obtained by the student?

  1. 85

  2. 78

  3. 82

  4. 79

  5. None of these
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C Correct answer
Explanation

Total marks = 60 + 75 + 85 + (95 * 2) = 220 + 190 = 410. Total weight = 1 + 1 + 1 + 2 = 5. Average = 410 / 5 = 82.

AI explanation

Using the weighted average method, the final examination counts twice as much as a monthly exam, so we treat the scores as five separate values. The total sum of the weighted scores is 60 + 75 + 85 + (2 multiplied by 95), which equals 410. Divide this sum by the total number of weights (5) to get 410 divided by 5, resulting in an average of 82 marks.

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