public class sort {    public static void main(String[] args) {

        int[][] scores = {                { 82, 90, 91 },                { 68, 72, 64 },                { 95, 91, 89 },                { 67, 52, 60 },                { 79, 81, 85 },        };        int sum = 0;        for (int i = 0;i < 5; i++){            for (int j =0; j < 3; j++){                sum += scores[i][j];            }        }        System.out.printf("这些学生的平均分为%.2f:",(float)sum/15);    }}