The document discusses different measures of central tendency: mean, median, and mode. It provides definitions and examples of how to calculate each. The mean is the average and is calculated by summing all values and dividing by the total number. The median is the middle value when values are sorted from lowest to highest. The mode is the most frequently occurring value. Each measure has advantages and disadvantages depending on the type of data and how skewed the distribution is. The mean is sensitive to outliers while the median and mode are not.