Final answer:
To find the median of a list of data, arrange the numbers in ascending order and determine the middle value. In this case, the median is 20.
Step-by-step explanation:
To find the median of a list of data, you need to arrange the numbers in ascending order and then determine the middle value. In this case, the data is: 22, 33, 17, 8, 17, 29, 18, 13, 26, 28. When arranged in ascending order, the list becomes: 8, 13, 17, 17, 18, 22, 26, 28, 29, 33. As there are 10 numbers in the list, the median will be the average of the two middle values, which are 18 and 22. Therefore, the median is (18 + 22) / 2 = 20.