The average age of everyone in a class is an example of descriptive statistics. Descriptive statistics summarize or describe the characteristics of a data set. They provide a way to present data that helps to understand the basic features of that data.
In this case, calculating the average age involves adding together the ages of all the students and dividing by the number of students. This gives a single value that represents the general age profile of the class, making it easier to comprehend than looking at each individual age. Descriptive statistics are useful for providing a quick overview and allowing for better understanding of the data at hand.