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The average marks obtained by 8 students in a certain exam is 51. The average marks obtained by another 9 students is 68. What will be the average marks obtained by all the students?
1. 50
2. 60
3. 40
4. 65

1 Answer

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Best answer
Correct Answer - Option 2 : 60

Given:

Average marks obtained by 8 students = 51

Average marks obtained by 9 students = 68

Calculation:

Total marks obtained by 8 students = 51 × 8

⇒ 408

Total marks obtained by 9 students = 68 × 9

⇒ 612

The total marks obtained by 17 students = 408 + 612

⇒ 1020

Required average = 1020 /17

⇒ 60

∴ The average marks of all the students are 60. 

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