C :

#include<stdio.h>
int main()
{
	int n;
	scanf("%d",&n);
	int i,j,a[n][3];
	for(i=0;i<n;i++){
		for(j=0;j<3;j++){
			scanf("%d",&a[i][j]);
		}
	}
	
	for(j=0;j<3;j++){
		double t;
		int s=0;
		for(i=0;i<n;i++){
			s+=a[i][j];
			t=(double)s/n;
		
		} 
		printf("%.1f ",t);
			 
	} 
	return 0;
}

C++ :

#include <bits/stdc++.h>
using namespace std;

int main(){
	int a[100][3];
	int n,i,j,s;
	double v;
	cin>>n;
	for(i = 0;i < n;i++){
		for(j = 0;j < 3;j++){
			cin>>a[i][j];
		} 
	}
	
	//先循环科目 
	for(j = 0;j < 3;j++){
		s = 0;
		//再循环人 
		for(i = 0;i < n;i++){
			//cout<<a[i][j]<<" ";
			s = s + a[i][j];
		} 
		
		v = s * 1.0 / n;//n个科目的成绩 
		cout<<fixed<<setprecision(1)<<v<<" ";
	}
}

Pascal :

var a,b,c:array[1..100000] of longint;
    i,n:longint;
    s:real;
begin
read(n);
for i:=1 to n do
read(a[i],b[i],c[i]);
for i:=1 to n do
begin 
s:=a[i]+s;
end;
s:=s/n;
write(s:0:1,' ');
s:=0;
for i:=1 to n do
begin 
s:=b[i]+s;
end;
s:=s/n;
write(s:0:1,' ');
s:=0;
for i:=1 to n do
begin 
s:=c[i]+s;
end;
s:=s/n;
write(s:0:1,' ');
end.

Java :

import java.util.Scanner;
public class Main
{
	public static void main(String args[]){
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		int[][] a=new int[n][3];
		for(int i=0;i<n;i++){
			for(int j=0;j<3;j++){
				a[i][j]=sc.nextInt();
			}
		}
		int yuwen=0,shuxue=0,yinyu=0;
		for(int i=0;i<n;i++){
			for(int j=0;j<3;j++){
				if(j==0){
					yuwen+=a[i][j];
				}
				if(j==1){
					shuxue+=a[i][j];
				}
				if(j==2){
					yinyu+=a[i][j];
				}
			}
		}
		double avg1=(double)yuwen/n;
		double avg2=(double)shuxue/n;
		double avg3=(double)yinyu/n;
		System.out.print(String.format("%.1f",avg1)+" ");
		System.out.print(String.format("%.1f",avg2)+" ");
		System.out.print(String.format("%.1f",avg3)+" ");
	}
}

Python :

n = int(input())
a = [[0 for j in range(3)] for i in range(n)]

yw = 0
sx = 0
yy = 0
for i in range(n):
    t = input().split()
    for j in range(3):
        a[i][j] = int(t[j])

for i in range(n):
    yw += a[i][0]
    sx += a[i][1]
    yy += a[i][2]
print('%.1f %.1f %.1f' % (yw / n, sx / n, yy / n), end='')