Final answer:
The five-number summary of the data set includes the minimum value, the first quartile, the median, the third quartile, and the maximum value.
Step-by-step explanation:
The five-number summary of the data set, 7, 13, 13, 15, 21, 25, 36, 38, includes the minimum value (7), the first quartile (Q1) which is the median of the lower half of the data (13), the median (also known as the second quartile, Q2) which is the middle value of the data set (19), the third quartile (Q3) which is the median of the upper half of the data (31), and the maximum value (38).