Q. The mean of marks secured by 45 students in division A of class X is 69, 65 students of division B is 65 and that of 50 students of division C is 63. Find the mean of marks of the students of three divisions of Class X.
A) 64.8
B) 65.5
C) 66.9
D) 64.1
✔ Correct Answer: 65.5
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