程序代码：

#include"iostream"
#include <iomanip>
using namespace std;
int main()
{
    int *judger, n,count;
    double avg;
    while (cin >> n)
    {
        if (n > 2 && n <= 100)
        {
            avg = 0;
            judger = (int*)calloc(n, sizeof(int));
            for (count = 0; count < n; count++)
            {
                cin >> judger[count];
            }
            for (count = 1; count < n - 1; count++)
            {
                avg += judger[count];
            }
            avg = avg / (n - 2);
            cout << fixed << setprecision(2) << avg << endl;
        }
    }
}