private void _calculateAverages(ICollection<Floor> list)
        {
            List<List<TimeSpan>> averages = new List<List<TimeSpan>>(5);
            for (int i = 0; i < 5; ++i)
            {
                averages.Add(new List<TimeSpan>());
            }
            foreach (var floor in list)
            {
                var cat = Tasks.DetermineCategory(floor);
                switch (cat)
                {
                    case Tasks.CATEGORY._5s:
                    averages[0].Add(floor.Time);
                    break;
                    case Tasks.CATEGORY._4s:
                    averages[1].Add(floor.Time);
                    break;
                    case Tasks.CATEGORY._3s:
                    averages[2].Add(floor.Time);
                    break;
                    case Tasks.CATEGORY.Duo:
                    averages[3].Add(floor.Time);
                    break;
                    case Tasks.CATEGORY.Solo:
                    averages[4].Add(floor.Time);
                    break;
                    default:
                    //do nothing
                    break;
                }

                List<TimeSpan> averageTimes = new List<TimeSpan>();
                if(averages[0].Count > 0) averageTimes.Add(TimeSpan.FromSeconds(averages[0].Average(i => i.TotalSeconds)));
                if (averages[1].Count > 0) averageTimes.Add(TimeSpan.FromSeconds(averages[1].Average(i => i.TotalSeconds)));
                if (averages[2].Count > 0) averageTimes.Add(TimeSpan.FromSeconds(averages[2].Average(i => i.TotalSeconds)));
                if (averages[3].Count > 0) averageTimes.Add(TimeSpan.FromSeconds(averages[3].Average(i => i.TotalSeconds)));
                if (averages[4].Count > 0) averageTimes.Add(TimeSpan.FromSeconds(averages[4].Average(i => i.TotalSeconds)));

                this.textBox3.Text = "5 Man: " + averageTimes[0].Minutes.ToString();
            }
        }