(a)arithmetic mean=   
 
    10.  
 
 (b)value of deviation=   
 
    0.  
 
    1.  
 
  - 1.  
 
    0.5  
 
  - 0.5  
 
 (c)algebric sum of deviation=   
 
    0.  
 
 (d)average deviation=   
 
    0.6  
 
 (e)standard deviation=   
 
    0.7905694  
 