To find the mode of the dataset \(13, 18, 13, 14, 13, 16, 14, 21, 13\), we need to identify the number that appears most frequently.
Let's count the occurrences of each number:
- 13 appears 5 times
- 14 appears 2 times
- 16 appears 1 time
- 18 appears 1 time
- 21 appears 1 time
The number 13 has the highest frequency (5 times), therefore the mode of the dataset is 13.