Eleven students are in a chess club. Mr. Kossow determined that the median age of the students in this chess club was 12 years old which of the following statements must be true? Select all that apply A. All of the students in the chess club are 12.
B. At least half of the students in the chess club were 12 or older.
C. At least half of the students in the chess club were 12 or younger. D. The average age of the students in the chess club was 12.
E. The oldest student in the chess club was 12.
F. When all the ages of the students in the chess club were listed in order, the middle value was 12.