string[,] scores = new string[8,2]{{"景珍","90"},{"林惠洋","65"},{"成蓉","88"},{"洪南昌","70"},{"龙玉民","46"},{"单江开","81"},{"田武山","100"},{"王三明","68"}};

          int avg=0;//平均分

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

                avg+=Convert.ToInt32(scores[i,1]);

            }

            avg = avg/8;

    string name ="";//高于平均分的名字

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

        if(Convert.ToInt32(scores[i,1])>=avg){

            name+=scores[i,0]+" ";

        }

   }

    name = name.Trim(' ');

    Console.WriteLine("平均分是{0}，高于平均分的有：",avg);

    Console.WriteLine(name);