Find the mean, median, mode, and range of a set of data. The mean is just what it sounds like - the average of all the numbers. We need to know this because it tells us how much an amount changes. The mode is the number that appears most often in a set of data. We have the median which tells us where half the values in the data are less than or greater than that number. Lastly, the range of a set of numbers is the difference between the smallest number and the largest number in the set. Find out