A) 51.3
B) 50.6
C) 52
D) 53.4
Correct Answer: C
Solution :
Required average \[=\frac{55\times 55+45\times 51+40\times 49}{55+45+40}\] \[=\frac{3025+2295+1960}{140}\] \[=\frac{7280}{140}=52\]You need to login to perform this action.
You will be redirected in
3 sec