A school has 4 section of Chemistry in Class X having 70, 35, 45 and 42 students. The mean marks obtained in Chemistry test are 50, 60, 55 and 45 respectively for the 4 sections. Determine the overall average of marks per student.
Choose the correct choice from the following.
A) 50.9	B) 52.9	C) 51.9	D) 53.25	E) None of the above
Required average marks   = 70Ã—50+35Ã—60+45Ã—55+42Ã—45/70+35+45+42   = 3500+2100+2475+1890/192   = 9965â„192 = 51.90   Answer 51.9
<result>C</result>
A school has 4 section of Chemistry in Class X having 70, 35, 45 and 42 students. The mean marks obtained in Chemistry test are 50, 60, 55 and 45 respectively for the 4 sections. Determine the overall average of marks per student.