Answer:
median: 33; modes: 28 and 33
Explanation:
There are 15 points in the data set, so the median value is the 8th one from either end. That value is 33.
The mode is the data value that appears most often in the data set. There are two values that appear twice: 28 and 33. No value appears 3 times, so both these numbers are modes of the data.