The mean of marks secured by 45 students in division A of class X is 5 – McqOptions

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1.	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. FindÂ the mean of marks of the students of three divisions of Class X.
A.	52.1
B.	51.4
C.	52.8
D.	54.2
Answer» D. 54.2

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