A school has 4 section of Chemistry in Class X having 65, 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 option.
A) 50.25	B) 52.25	C) 51.95	D) 53.25	E) None of the above
Required average marks   = 65Ã—50+35Ã—60+45Ã—55+42Ã—45/65+35+45+42   = 3250+2100+2475+1890/187   = 9715â„187 = 51.95   Answer 51.95
<result>C</result>
A school has 4 section of Chemistry in Class X having 65, 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.