C :

#include<stdio.h>
#include<math.h>
int main()
{int i,j;
	double a[5] [10],s,max,l=0,w=0,t;
	for(i=0;i<5;i++)
	{
		for(j=0;j<10;j++)
		{
			scanf("%lf",&a[i] [j]);
		}
	}
	for(j=0;j<10;j++)
	{
		s=0;
		for(i=0;i<5;i++)
		{
			s=s+a[i] [j];
		}
		l=l+pow(s/5,2),w=w+s/5;
		printf("%.2f ",s/5);
	}
	printf("\n");
	for(i=0;i<5;i++)
	{
		s=0;
		for(j=0;j<10;j++)
		{
			s=s+a[i] [j];
		}
		printf("%.2f ",s/10);
	}
	printf("\n");
	for(i=0;i<5;i++)
	{
		for(j=0;j<10;j++)
		{
			if(a[i] [j]>max)
				max=a[i] [j];
		}
	}
	for(i=0;i<5;i++)
	{
		for(j=0;j<10;j++)
		{
			if(a[i] [j]==max)
			break;
		}
		if(a[i] [j]==max)
			break;
	}
	printf("%.2f %d %d",max,i,j);
	printf("\n");
	t=l/10-pow(w/10,2);
	printf("%.2f\n",t);
	return 0;
}

C++ :

#include <stdio.h>
#include <math.h>
int main() {
	void student_aver(float score[][10]);
	void class_aver(float score[][10]);
	void top(float score[][10]);
	float sigma(float score[][10]);
	float score[5][10];
	int i, j;
	for (i = 0;i < 5;i++) {
		for (j = 0;j < 10;j++) {
			scanf("%f", &score[i][j]);
		}
	}
	student_aver(score);
	class_aver(score);
	top(score);
	printf("%.2f\n", sigma(score));
	return 0;
}
void student_aver(float score[][10]) {
	float aver[10];
	int i, j;
	for (i = 0;i < 10;i++)
		aver[i] = 0;
	for (i = 0;i < 5;i++)
		for (j = 0;j < 10;j++)
			aver[j] += score[i][j];
	for (i = 0;i < 10;i++)
		aver[i] /= 5;
	for (i = 0;i < 10;i++)
		printf("%.2f ", aver[i]);
	puts("");
}
void class_aver(float score[][10]) {
	float aver[5];
	int i, j;
	for (i = 0;i < 5;i++)
		aver[i] = 0;
	for (i = 0;i < 5;i++)
		for (j = 0;j < 10;j++)
			aver[i] += score[i][j];
	for (i = 0;i < 5;i++)
		aver[i] /= 10;
	for (i = 0;i < 5;i++)
		printf("%.2f ", aver[i]);
	puts("");
}
void top(float score[][10]) {
	float max = score[0][0];
	int i, j, maxi, maxj;
	for (i = 0;i < 5;i++) {
		for (j = 0;j < 10;j++) {
			if (score[i][j] > max) {
				max = score[i][j];
				maxi = i;
				maxj = j;
			}
		}
	}
	printf("%.2f %d %d\n", max, maxi, maxj);
}
float sigma(float score[][10]) {
	float aver[10];
	float sigma, part1, part2;
	int i, j;
	for (i = 0;i < 10;i++)
		aver[i] = 0;
	for (i = 0;i < 5;i++)
		for (j = 0;j < 10;j++)
			aver[j] += score[i][j];
	for (i = 0;i < 10;i++)
		aver[i] /= 5;
	part1 = part2 = 0;
	for (i = 0;i < 10;i++)
		part1 += aver[i] * aver[i];
	part1 /= 10;
	for (i = 0;i < 10;i++)
		part2 += aver[i];
	part2 /= 10;
	part2 = part2 * part2;
	sigma = part1 - part2;
	return sigma;
}

Java :

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

public class Main{
  private static Scanner s = new Scanner(System.in) ;
  
  public static void main(String[] args) {
	   DecimalFormat df = new DecimalFormat("0.00") ;
	  double a[][] = new double[5][10] ;
	  double b[] = new double[10] ;
	  for (int i = 0; i < a.length; i++) {
		for (int j = 0; j < a[i].length; j++) {
			double temp = s.nextDouble() ;
			if(0<=temp&&temp<=100)
				a[i][j] = temp ;
		}
	}
	  double sum = 0 ;
	  for (int i = 0; i < a[0].length; i++) {
			 for (int j = 0; j < a.length; j++) {
				sum = sum + a[j][i] ; 
			 }
			 b[i] = sum/a.length ;
			 System.out.print(df.format(b[i])+" ");
			 sum = 0 ;
		  }
	  System.out.println() ;
	  for (int i = 0; i < a.length; i++) {
		 for (int j = 0; j < a[i].length; j++) {
			sum = sum + a[i][j] ; 
		 }
		 System.out.print(df.format(sum/a[0].length)+" ");
		 sum = 0 ;
	  }
	  System.out.println() ;
	  double max = 0 ;
	  int x = 0 ;
	  int y = 0 ;
	  for (int i = 0; i < a.length; i++) {
		for (int j = 0; j < a[i].length; j++) {
			if(a[i][j]>max){
				max = a[i][j] ;
				x = i ;
				y = j ;
			}
		}
	}
	  System.out.println(df.format(max)+" "+x + " "+ y);
	  
	  double xx = 0 ;
	  double yy = 0 ;
	  for (int i = 0; i < b.length; i++) {
		  xx = xx + b[i]*b[i] ;
		  yy = yy + b[i] ;
	  }
	  int n = b.length ;
	  System.out.println(df.format(xx/n-(yy/n)*(yy/n)));
  }
}