public class Main {

public static void main(String[] args) {

int[][] scores = { 

{ 82, 90, 91 }, 

{ 68, 72, 64 }, 

{ 95, 91, 89 }, 

{ 67, 52, 60 }, 

{ 79, 81, 85 }, 

};

double average = 0;

int sum=0;

for(int[]ns:scores) {

for(int n:ns) {

sum=sum+n;}

average=(double)sum/(scores.length*ns.length);

}

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");

}

}

}