为什么会计算两次？求大神解答。

Question

 string[] name = new string[2];            int[] score = new int[2];            for (int i = 0; i < name.Length; i++)            {                Console.Write("请输入第" + (i + 1) + "名的姓名:");                name[i] = Console.ReadLine();                Console.Write("请输入第" + (i + 1) + "名的分数:");                score[i] = int.Parse(Console.ReadLine());            }            int sum = 0, avg;            int j = 0;            for (int i = 0; i < score.Length; i++)            {                {                    sum += score[i];                }                avg = sum /( score.Length);                {                    if (score[i] > avg)                        j = i;                }                score[i] = avg;                Console.Write("平均值:{0}高于平均值的同学:{1}", avg, name[i]);