Question

The number of students in two classes A and
B and the respective "mean" of the marks
obtained by each of the class are given in
the following table:
Class A
Class B
Number of Students 20 80
Arithmetic Mean 10 20
The combined "mean" of the marks of the
two classes will be:

Answer 1

Answer:

20+80/10+20:

I think it's right bro

Answer 2

Step-by-step explanation:

combined mean =Nx1+Nx2/N1+N2

20*10+80*20/20+80

200+1600/100

1800/100

ans is 18