#include <stdio.h>

#define NMAX 100

main()
{
	int i,n;
	int data[NMAX];	
	double ave,hensa;

	FILE *fp;

	fp=fopen("sample1.dat","r");
	if(fp == NULL){
		printf("File can not open !!\n");
		exit(1);
	}

	fscanf(fp,"%d",&n);
	for(i=0;i<n;i++)fscanf(fp,"%d",&data[i]);

	fclose(fp);

	ave=0.0;
	for(i=0;i<n;i++){
		ave=ave+data[i];
	}
	ave=ave/n;

	hensa=0.0;
	for(i=0;i<n;i++){
                hensa=hensa+(ave-data[i])*(ave-data[i]);
        }
	hensa=hensa/n;

	fp=fopen("sample2.dat","w");
        if(fp == NULL){
                printf("File can not open !!\n");
                exit(1);
        }
	fprintf(fp,"Ê¿¶ÑÅÀ = %f\n",ave);
	fprintf(fp,"ʬ»¶ = %f\n",hensa);

	fclose(fp);
	
	exit(0);

}