a school has 4 section of chemistry in class x having 60 , 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 .
"required average marks = 60 ã — 50 + 35 ã — 60 + 45 ã — 55 + 42 ã — 45 / 60 + 35 + 45 + 42 = 3000 + 2100 + 2475 + 1890 / 182 = 9465 â  „ 182 = 52 answer b"
divide(add(add(add(multiply(60, 50), multiply(35, 60)), multiply(45, 55)), multiply(42, 45)), add(add(add(60, 35), 45), 42))