public class Main {
	public static void main(String[] args) {
		// 用二维数组表示的学生成绩:
		int[][] scores = { 
				{ 82, 90, 91 }, 
				{ 68, 72, 64 }, 
				{ 95, 91, 89 }, 
				{ 67, 52, 60 }, 
				{ 79, 81, 85 }, 
		};
		// TODO:
		int sum = 0;
		int count = 0;
		for (int[] arr : scores) {
			for (int n : arr) {
				sum = sum + n;
				count++;
			}
		}
		double average = 0;
		average = (double)sum/count;
		System.out.println(average);
		if (Math.abs(average - 77.733333) < 0.000001) {
			System.out.println("测试成功");
		} else {
			System.out.println("测试失败");
		}
	}
}