Mean, median, and mode are different measures of center in a numerical data set. They each try to summarize a dataset with a single number to represent a "typical" data point from the dataset.

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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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 …

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

Which mean are we talking about in "standard error of the mean"? The question comes up, as there are at least 3 types of means in the question: the actual population parameter, means of …

If you remove a number that equals the mean of the original list of numbers, the mean will remain the same. So if you remove a middle number, the effect on the mean will depend on how that …

To find the mean, you add up all of the numbers together and then divide the sum by the total amount of values (there are 4 values). Since only one of those numbers is increasing, the …

Example showing how to check which conditions have been met for a t test about a mean

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