1. The mode of a data set is the value that appears most frequently. 2. To find the mode, first list all the numbers in the data set. 3. Count how many times each number appears. 4. Identify the number(s) that appear the most times. 5. If one number appears most frequently, that is the mode. 6. If multiple numbers tie for most frequent, all of them are modes (the data set is multimodal). 7. If no number repeats, the data set has no mode. Example: For the data set $\{2, 3, 3, 5, 7\}$, the number 3 appears twice and more than any other number, so the mode is 3.