A school has 4 sections 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.
Note
Average marks = (50×40+60×35+55×45+45×42)/(40+35+45+42)
= (2000+2100+2475+1890)/162
= (8465/162)
= 52.25