Use the fоllоwing infоrmаtion to аnswer Questions 13 to 16 15 student workers were аsked how many hours they spent at their jobs during the first week of the semester. Their answers are below: 4, 5, 7, 9, 10, 10, 12, 16, 19, 20, 21, 21, 21, 28, 35 Determine the mode. Select all answers that apply.