Consider the data set 12, 12, 15, 15, 15, 18, 18 and 18. Which statements about the mode of this data set are true? Select all that apply.

Explication

Both 15 and 18 occur three times while 12 occurs twice, so two values tie at the highest frequency and the set has two modes. Reporting only 15 because it appears earlier in the list uses reading order to break a tie, and the order in which data are written down carries no information about frequency.