A school has 4 section of Chemistry in Class X having 55, 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. Pick:
A) 50.15
B) 52.06
C) 51.25
D) 53.06
E) None of the above
Required average marks   = 55Ã—50+35Ã—60+45Ã—55+42Ã—45/55+35+45+42   = 2750+2100+2475+1890/162   = 9215â„177 = 52.06   Answer 52.06
<result>B</result>
A school has 4 section of Chemistry in Class X having 55, 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.