A school has 4 section of Chemistry in Class X having 50, 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. Options:
A) 50.12 B) 52.12 C) 51.12 D) 53.12 E) None of the above
Required average marks   = 50Ã—50+35Ã—60+45Ã—55+42Ã—45/50+35+45+42   = 2500+2100+2475+1890/172   = 8965â„172 = 52.12   Answer 52.12
<result>B</result>
A school has 4 section of Chemistry in Class X having 50, 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.