To find the mode of the data set, we need to identify the number that appears most frequently.
The given data is: 13, 18, 13, 14, 13, 16, 14, 21, 13.
Let's count the frequency 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 that appears most frequently is 13, which appears 5 times.
Thus, the mode of the data set is 13.
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