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

1. 59
2. 59.5
3. 60
4. 60.5

Correct answer: 60

Solution

The total marks of 8 students is 8 × 51 = 408 and of 9 students is 9 × 68 = 612. Their combined total is 1020, and 1020/17 = 60.

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