#include<iostream>
using namespace std;
#include<iomanip> //Thu vien de dung cac dinh dang
main()
{
       cout<<fixed<<setiosflags(ios::showpoint)<<setprecision(2);//dinh danh sau dau phay,(2 so sau dau phay)
       float a[100];//khai bao kieu so thuc
       float n,tbc,s=0;//kieu so thuc
       cout<<"n= "; cin>>n;//nhap so phan tu muon tinh tbc
       for (int i=1;i<=n;i++)//nhap cac phan tu muon tinh trung binh cong
           {
                 cout<<"a["<<i<<"]= ";  
                 cin>>a[i];
           }
       for (int i=1;i<=n;i++)//tinh tong
           s=s+a[i];
       tbc=s/n;//gan
       cout<<tbc;//in ra tbc
       system("pause");
       return 0;      
}