Service MyService{}
 
   // variables and constants can be here
 
   function calculate(myScore INT[]) returns (Decimal (4,2)) 
 
      numberOfScores, i, mySum INT;
      numberOfScores = myScore.getSize();
 
      for (i from 1 to numberOfScores by 1)
         mySum = myScore[i] + mySum;	       
      end
 
      return(mySum/numberOfScores);
   end
 
   // other functions are here
 
end