Example: The following data refer to the number of days the workers were absent from their work due to illness during the year preceding the inquiry. 22 29 16 15 18 17 12 13 17 16 10 21 15 14 17 18 12 20 14 16 22 14 25 19 23 15 19 18 23 22 13 18 24 24 26 13 18 17 27 24 18 17 21 16 21 25 19 20 15 16