This document defines and provides examples for calculating the mean, median, mode, and range of data sets. It explains that the mean is the average found by adding all values and dividing by the number of values. The median is the middle value when values are ordered from lowest to highest. The mode is the most frequently occurring value. The range is the difference between the highest and lowest values. Step-by-step instructions and examples are given for calculating each measure of central tendency and dispersion.