Refer to the following letter, number, symbol series and answer the question.
(Left) E 7 8 # K 2 L ? = R 3 @ W * X 5 C H D 4 (Right)
If all numbers are dropped from the series, which of the following will be seventh from the left?
Find the mode for the following data of student ages:
16, 17, 15, 17, 16, 15, 14, 14, 13, 17, 13, 12, 12, 16, 10, 14, 17, 10, 11.