SOLUTION: Two mathematics classes in Year 12 general maths course sat for some assessment task and some results are shown below: Class 1: Number of students=25 and average mark is 52% Cl

Question 770242: Two mathematics classes in Year 12 general maths course sat for some assessment task and some results are shown below:
Class 1: Number of students=25 and average mark is 52%
Class2: Number of students=20 and average mark is 70%
What is average mark for the course?
PS. I calculated the answer to be 61 but apparently that is incorrect. This was shown by:
52 plus 70 divided by 2
Answer by ramkikk66(644) (Show Source): You can put this solution on YOUR website!

Class 1: Number of students=25 and average mark is 52%
Class2: Number of students=20 and average mark is 70% 
What is average mark for the course? 
Ans:
You cannot just take the overall average as 52 plus 70 divided by 2, because
the number of students in each class is different.
Average = total number of marks / number of students.
Therefore total marks = Number of students * average.
Class1: Average = 52, students = 25, so total = 52*25 = 1300
Class2: Average = 70, students = 20, so total = 70*20 = 1400
Overall average for the course = Total marks of both the classes / total students 
of both the classes
= 
Hope you got it :)

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