一、题目描述

二、代码

#include <iostream>
#include<iomanip>using namespace std;int main()
{int n;cin >> n;double a[n];for(int i=0;i<n;i++){cin >> a[i];}double num = 0;for(int i=0;i<n;i++){num = num + a[i];}double result = num / n;cout << num << " "<< fixed << setprecision(5) << result;return 0;
}