static void Main(string[] args)
{
GradeTracker book = CreateGradeBook();
book.AddGrades(new List <double>()
{
91, 90, 87.5
});
book.WriteGrades();
GradeStatistics stats = book.ComputeStats();
WriteResult("Average", stats.AverageGrade);
}
private static void AddGrades(GradeTracker book)
{
book.AddGrades(91);
book.AddGrades(89.5f);
book.AddGrades(75);
}