4.10

#define  _CRT_SECURE_NO_WARNINGS#include<iostream>#include<array>using namespace std;int main(){double sum = 0;array<double, 3>average_for_40meter;for (int i = 0; i < 3; i++){cout << "Please enter the scores of " << i + 1 << "th: ";cin >> average_for_40meter[i];sum += average_for_40meter[i];}double average = sum / 3;cout << "The average score of 40 meters is: " << average << endl;return 0;}