The mean weight of 150 students in class is 60 kg. The mean weight – McqOptions

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1.	The mean weight of 150 students in class is 60 kg. The mean weight of boys is 70 kg and that of girls is 55 kg. What is the number of boys in the class ?
A.	50
B.	70
C.	90
D.	110
Answer» B. 70

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