Answer : Option B
Explanation :
Average marks of batch1 = 50
Students in batch1 = 55
$MF#%\text{Total marks of batch1} = 55 \times 50$MF#%
Average marks of batch2 = 55
Students in batch2 = 60
$MF#%\text{Total marks of batch2} = 60\times 55$MF#%
Average marks of batch3 = 60
Students in batch3 = 45
$MF#%\text{Total marks of batch3} = 45 \times 60 $MF#%
Total students = 55 + 60 + 45 = 160
$MF#%\text{Average marks of all the students = }\dfrac{ \left(55 \times 50 \right)+ \left(60 \times 55 \right)+ \left( 45 \times 60 \right)}{160}
\\\\= \dfrac{275+ 330+ 270}{16} = \dfrac{875}{16} = 54.68$MF#%
Submit Comment/FeedBack