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;
}