| Average marks obtained by 9 students in ok row of a class is 45. One student with 35 marks exchanges his seat with a student securing 48 marks. What is the average marks of these 9 students of this row? |
A) 56.4
B) 46.4
C) 47.6
D) 45.6
Correct Answer: B
Solution :
| [b] Total marks \[=9\times 45=405\] |
| According to question, \[405-35+48=418\] |
| \[\therefore \] Average marks \[=\frac{418}{9}=46.4\] |
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