This document discusses measures of central tendency including the mean, median, and mode. It provides definitions and formulas for calculating each measure. The mean is the average value and is calculated by summing all values and dividing by the total number of values. The median is the middle value when values are arranged in order. The mode is the value that occurs most frequently. The document discusses when each measure is most appropriate to use and provides examples of calculating the mean, median, and mode. It also covers the properties, merits, and demerits of each measure of central tendency.