Question

In a class there are two sections- a and



b. section a has 50 students and section b has 75 students. the student of both the sections took a maths test. the average marks of section a and b are 30 marks and 40 marks respectively. what are the average marks of the whole class?

Answer 1

sec a. has 50 students
sec b has 75 students
avg marks of sec a is 30
avg marks of sec b is 40

avg= sum of all observation divided by total no of observation
total marks in sec a is 1500
total marks in sec b is 3000
1500+3000=4500
total students in sec a and b are 125
so 4500 divided by 125 =90
so avg marks of whole class is 90