Statistics: Mean, Median & Mode

Interactive tutorial • practice problems • speed quiz

What's the Difference?

In statistics, mean, median, and mode are all measures of central tendency. They each describe a "typical" value in a dataset, but they are calculated in different ways.

The **Mean** is the average of a dataset. You find it by summing all the numbers and dividing by the count of numbers. $$\text{Mean} = \frac{\sum x}{n}$$

The **Median** is the middle value in a dataset when the numbers are arranged in order. If there is an even number of values, it's the average of the two middle numbers.

The **Mode** is the value that appears most frequently in a dataset. A dataset can have one mode, more than one mode (bimodal, trimodal, etc.), or no mode at all.

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Visual Tutorial

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Practice Problems

Calculate the requested measure for each dataset.

1) Dataset: [3, 5, 5, 8, 9]
Find the Mode.
2) Dataset: [10, 20, 30, 40]
Find the Mean.
3) Dataset: [7, 2, 9, 4, 6]
Find the Median.
4) Dataset: [1, 2, 3, 4, 5, 6]
Find the Median.

⚡ Statistics Speed Quiz

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