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

The mean (average) of a data set is found by adding all numbers in the data set and then dividing by the number of values in the set. The median is the middle value when a data set is ordered from least to …

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

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

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!

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

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

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 …

Mean and median both try to measure the "central tendency" in a data set. The goal of each is to get an idea of a "typical" value in the data set. The mean is commonly used, but sometimes the median is …