This module is concerned with statistics: collecting and describing data. In statistics, we are interested in visualizing data in graphical representations and examining its shape. We look at other characteristics, too, such as where the data appears to be centered, and its variability. Certain numerical averages called mean, median, and mode help us describe the central tendency of a data set. We can summarize how many times we observe a particular characteristic in a sample of observations using ratios called proportions. In this module, you’ll study graphical representations and compute the mean, median, and mode as measures of central tendency of a data set. Prepare to explore these ideas in this review section by learning how to find the mean, median, and mode of a list of numbers.