C++ :

#include <iostream>
using namespace std;
int main() {
    int arr[] = {3, 5, 7, 9, 11};
    int sum = 0;
    for (int i = 0; i < 5; i++) {
        sum += arr[i];
    }
    double avg = double(sum) / 5;
    cout << avg;
    return 0;
}