If the average marks of three batches of 55, 60, and 45 students are 50, 55, and 60, respectively, the overall average marks are:
A. 53.33
B. 54.68
C. 55
D. .None of these
Answer:B
If the average marks of three batches of 55, 60, and 45 students are 50, 55, and 60, respectively, the overall average marks are:
A. 53.33 B. 54.68 C. 55 D. .None of these
Explanation: Average required = 55 x 50 + 60 x 55 + 45 x 60 /55 + 60 + 45 x 60,2750 + 3300 + 2700/160 = 2750 + 3300 + 2700/160= 8750/160=54.68 %