Question

13. In a class of 100 students, the mean marks obtained in a subject is 30 and in another class of
50 students the mean marks obtained in the same subject is 60. The mean marks obtained by
the students of two classes taken together is:
(C.D.S. 1991)
(b) 45
(d) 50
(c) 48
(a) 40​

Answer 1

Answer:

40

Step-by-step explanation:

Mean of 100 students =30

Mean of 50 students =60

Mean of 150 students =  

150

100∗30+50∗60

​  

 

=  

150

3000+3000

​  

 

=  

150

6000

​  

 

=40

Hence, mean marks obtained is 40.