Letâ€™s say you have 5 people take an aptitude test and the maximum possible score is 100. The **mean score** is calculated by taking the sum of all the data values and dividing it by the total number who took the test. In other words, you **add all the scores together and then divide the total by the number of scores** (in this case, 5):

56 + 75 + 94 + 82 + 67 = 374

374/5 = 74.8

Therefore, in this case, the mean score is 74.8.