A school has 4 section of Chemistry in Class X having 40, 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
A) 50.25	B) 52.25	C) 51.25	D) 53.25	E) None of the above
Required average marks   = 40×50+35×60+45×55+42×45/40+35+45+42   = 2000+2100+2475+1890/162   = 8465⁄162 = 52.25   Answer 52.25
<result>B</result>
A school has 4 section of Chemistry in Class X having 40, 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.