Multiple choice

The average of the marks obtained in an examination by 8 students was 51 and by 9 other students was 68. The average marks of the 17 students was:

  1. 59

  2. 59.5

  3. 60

  4. 60.5
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

To find the combined average, first calculate total marks for each group: 8 × 51 = 408 and 9 × 68 = 612. Add these to get 1020 total marks for all 17 students. Divide 1020 by 17 to get the combined average of 60. This is a weighted average problem where the weights are the number of students in each group.

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