int sum = 0;

        int m = 0;

        for (int i=0;i<scores.length;i++) {

         for (int j=0;j<scores[i].length;j++) {

          sum = sum + scores[i][j];

          m++;

         }

        }

        double average = 0;

        //average = sum/m/1.0;

        average = (double)sum /m;

        //用double转型

        System.out.println(average);