Meаn refers tо the mаthemаtical average оf a grоup of numbers. If I wanted to calculate the mean grade on a test in this class, I would add all of the test scores together and then divide it by the number of people in the class. Median refers to the halfway point in a group of numbers. At the median score, half of the grades would be higher than the median, and half of the grades would be lower than the median. In order to calculate the median, I would need to list all of the scores in order from highest to lowest and then find the score in the middle. If I added all of the test scores together and divided it by the number of people in the class, I would have calculated the: