Convert the following data to z scores to determine who scored above, below, and at the mean in this sample:
18, 12, 17, 8, 23, 7, 10, 10, 12, 25, 19, 14, 14, 14, 9, 17, 21, 7, 11, 8, 8, 12, 8, 20, 16, 14, 14, 18, 5, 19, 20, 25, 14, 14, 15, 11, 19, 8, 10, 14