A) 37.5
B) 42.5
C) 45
D) 50.5
Correct Answer: A
Solution :
| [a] Sum of the marks of 28 students \[=(50\times 28)=1400\] Average of 20 students \[=(50+5)=55\] Sum of the marks of 20 students \[=(55\times 20)=1100\] Sum of the marks of 8 students \[=(1400-1100)=300\] Average of the marks of 8 students \[=\frac{300}{8}=37.5\] |
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