Q. The mean of marks secured by 45 students in division A of class X is 56, 40 students of division B is 52 and that of 40 students of division C is 50. Find the mean of marks of the students of three divisions of Class X.
A) 51.4
B) 52.1
C) 54.2
D) 52.8
✔ Correct Answer: 52.8
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