public static double AverageNNumbers(int n)
        {
            double avg = 0;
            int num = 0;
            for (int i = 0; i < n; i++)
            {
                Console.WriteLine("Enter a number: ");
                num = int.Parse(Console.ReadLine());
                avg = avg + num;
            }
            avg = avg / n;
            return avg;
        }