Ashutosh sir didnt understand your explanation, you didnt tell what deviation is and didnt explain clearly. 
Please explain again!
T h e   s u m   o f   d e v i a t i o n   o f   a   s e t   o f   v a l u e s   x 1 , x 2 , . . . . . . . . , x n , m e a s u r e d   f r o m   50   i s   - 10     a n d   t h e   s u m   o f   d e v i a t i o n   o f   t h e   v a l u e s   f r o m   46   i s   70 . F i n d   t h e   v a l u e   o f   n   a n d   t h e   m e a n .
 

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