C++ :

#include<iostream>
#include<cstdio>
using namespace std;
double a[105];
int main(){
	int n;
	double sum=0,ave;
	cin>>n;
	for (int i=0; i<n; i++){
		cin>>a[i];
		sum+=a[i];
	}
	ave=sum/n;
	printf("%.2lf\n",ave);
	for (int i=0; i<n; i++)
		if (a[i]<ave) printf("%.1lf\n",a[i]);
	return 0;
}