static void Main(string[] args) { Console.WriteLine("Hej"); GradeBook book1 = new GradeBook(); book1.AddGrade(22f); List <float> allGrades = book1.getAllGrades(); Console.WriteLine(allGrades.First()); GradeStatistics stats = book1.ComputeGradeStatistics(); WriteResult("Average", stats.AverageGrade); }