This document discusses different measures of central tendency including the mode, median, and mean. It provides examples of how to calculate each measure using both raw and grouped data. The mode is the most common value, and is appropriate for qualitative or nominal level data. The median is the middle value when data is ordered from lowest to highest, and is used for ordinal or interval level data. The mean is the average and is calculated by summing the product of each value and its frequency, divided by the total number of values. It requires interval level data. The appropriate measure depends on the level of measurement and research objective.