C :

#include<stdio.h>
#include<stdlib.h>
int main()
{
  double sum=0,ava=0;
  int n,i,j;
  int a[3][4];
  for(i=0;i<3;i++)
    for(j=0;j<4;j++)
  {
    scanf("%d",&a[i][j]);
    sum=sum+a[i][j];
  }
  scanf("%d",&n);
  ava=sum/12;
  printf("%.2lf\n",ava);
  for(i=n,j=0;j<4;j++)
    printf("%d ",a[i][j]);
  printf("\n");
}

C++ :

#include <stdio.h>
int main() {
	int a[3][4];
	int i, j, n;
	float tot, aveg;
	tot = 0;
	for (i = 0;i < 3;i++)
		for (j = 0;j < 4;j++)
			scanf("%d", &a[i][j]);
	scanf("%d", &n);
	for (i = 0;i < 3;i++)
		for (j = 0;j < 4;j++)
			tot += a[i][j];
	aveg = tot / (3 * 4);
	printf("%.2f\n", aveg);
	for (i = 0;i < 4;i++)
		printf("%d ", a[n][i]);
	printf("\n");
	return 0;
}

Java :

import java.text.DecimalFormat;
import java.util.Scanner;

public class Main{
   private static Scanner s = new Scanner(System.in) ;
   private static DecimalFormat df = new DecimalFormat("0.00") ;
   public static void main(String[] args) {
	  int a[][] = new int[3][4] ;
	  
	  for (int i = 0; i < a.length; i++) {
		 for (int j = 0; j < a[i].length; j++) {
			int temp = s.nextInt();
			if(temp>=0&&temp<=100)
				a[i][j] = temp ;
		}
	  }
	  
	  double score = 0 ;
	  
	  
	  int n = s.nextInt() ;
	  for (int i = 0; i < a.length; i++) {
			 for (int j = 0; j < a[0].length; j++) {
				score = score + a[i][j] ;
			 }
		  }
	  System.out.println(df.format(score/12)) ;
	  for (int i = 0; i < a[n].length; i++) {
		 System.out.print(a[n][i]+" ") ;
	  }
	  
		  
   }
}