#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define NMAX 100000000

int main()
{
	int i = 0, x = 0, length = NMAX;
	unsigned long long somme = 0;
	double moy = .0;

	srand(time(NULL));
	for(i = 0; i < length; i++)
	  somme += rand()%100;

	moy = (double)somme / length;
	printf( "%.2f\n", moy );

	return 0;
} /* main() */