I don't understand this

6. In high school Mr. Mahaney went to a very small school, his graduating class only had 15 students. There were only 5 students in his AP Calculus class. Here are the scores from one of the tests in that class. Student A: 96 Student B: 82 Student C: 88 Student D: 76 Student E: 86 a. List all possible SRS of size n = 3 and compute the mean of each sample. b. Display the sampling distribution of your means on a dotplot