In statistics, the mean is a measure of central tendency that represents the average of a set of numbers. It is calculated by adding up all the numbers in the set and then dividing by the total number of numbers. The mean is a useful statistic because it can be used to compare different sets of data and to make inferences about the population from which the data was collected.
The mean is also known as the arithmetic average or the expected value. It is an important statistic because it can be used to make predictions about future events. For example, if you know the mean height of a population of people, you can use that information to predict the height of a new person who joins the population.