Candidates of four schools appear in a mathematics test. The data is as follows:

Schools
No. of candidates
Average score
I 60 75
II 48 80
III Not available 55
IV 40 50

If the mean score of all four schools is 66, find the number of candidates who appeared from School III.

Asked by Topperlearning User | 6th Nov, 2017, 01:05: PM

Expert Answer:

Let the number of candidates who appeared from school III be m.
 
Thus, we have

     
    
         xifi
     75
     60
        4500
     80
     48
        3840
     55
     m
         55 m
    50
     40
        2000
 
148+m

10340+55m

 

 

 
 
 

 

Error converting from MathML to accessible text.

Answered by  | 6th Nov, 2017, 03:05: PM