public override StatisticDisplayer computeStatistics()
        {
            StatisticDisplayer statisticDisplayer = new StatisticDisplayer();

            foreach (var grade in grades)
            {
                statisticDisplayer.enrollGrade(grade);
            }
            return(statisticDisplayer);
        }
        public override StatisticDisplayer computeStatistics()
        {
            StatisticDisplayer statistic = new StatisticDisplayer();

            using (StreamReader reader = File.OpenText($"{nameof(Name)}.txt"))
            {
                string line;
                while ((line = reader.ReadLine()) != null)
                {
                    line = line.Trim();
                    statistic.enrollGrade(double.Parse(line));
                }
            }
            return(statistic);
        }