Learn about mean, median, and mode with Khan Academy's comprehensive review of these fundamental concepts in statistics.

Learn how to calculate the mean by walking through some basic examples & trying practice problems.

Here we give you a set of numbers and then ask you to find the mean, median, and mode. It's your first opportunity to practice with us!

Practice calculating the mean (average) of a data set. The mean gives us a sense of the middle, or center, of the data.

Practice calculating and interpreting the mean and standard deviation of a discrete random variable.

Calculate the mean, median, or mode of a data set!

Practice finding the median of a data set. Like the mean, the median gives us a sense of the middle, or center, of the data.

Much of statistics is based upon using data from a random sample that is representative of the population at large. From that sample mean, we can infer things about the greater population mean. …

The Mean Value Theorem states that if a function f is continuous on the closed interval [a,b] and differentiable on the open interval (a,b), then there exists a point c in the interval (a,b) such that f'(c) …

Mean absolute deviation (MAD) of a data set is the average distance between each data value and the mean. Mean absolute deviation is a way to describe variation in a data set. Mean absolute deviation …