[Programmers]평균 구하기

https://school.programmers.co.kr/learn/courses/30/lessons/12944

프로그래머스

#include <string>
#include <vector>

using namespace std;

double solution(vector<int> arr) {
    double answer = 0;
    
    for(auto avg : arr){
        answer += avg;
    }
    
    return answer / arr.size();
}