A) 45%
B) 50%
C) 51.4% approx.
D) 54.6% approx.
Correct Answer: C
Solution :
Let mean score of remaining 55% = x \[52=\frac{20\times 580+25\times 31+55\times x}{100}\] \[\Rightarrow \] \[5200=1600+775+55x\] \[\Rightarrow \] \[55=5200+1600-775\] = 2825 \[\therefore \] \[x=\frac{2825}{55}=51.36=51.4\,\,(approx.)\]You need to login to perform this action.
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