static void Main(string[] args) { GradeBook book = new GradeBook(); book.AddGrade(90.5); book.AddGrade(85.5); book.AddGrade(75.5); GradeStatistics stats = book.ComputeStatistics(); Console.WriteLine("List of Grades in the Grade Book"); book.DisplayGradeBook(); Console.WriteLine("Average Grade " + stats.AverageGrade); Console.WriteLine("Highest Grade " + stats.HighestGrade); Console.WriteLine("Lowest Grade " + stats.LowestGrade); }