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

#define MAX 10000
#define UNIT 100

int main(){
    int i;
    double sum=0;
    
    srand((unsigned)time(NULL));
    for(i=0;i<MAX;i++){
        sum+=(double)rand()/RAND_MAX;
        if((i+1)%UNIT==0){
            printf("%d,%f\n",i+1,sum/(i+1));
        }
    }
    return 0;
}