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🔢 Mean, Median, Mode, and Range

Learn the key words of statistics — mean, median, mode, range, outlier, correlation — and what each one actually tells you about a set of data.

3
lessons
~15 min
to learn
🔢 Math
subject
Ages 6–12
level
Start the course →

What you’ll learn

  1. Three Kinds of AverageDefine and find the mode, median, and mean of a small data set.Three averages describe the 'middle' of data in different ways: the mode is the most common value, the median is the middle value once sorted, and the mean shares the total equally (add them all, divide by how many). Each answers a slightly different question about the data.
  2. Range and OutliersFind the range and recognise how an outlier affects the mean.The range measures spread — biggest value minus smallest — rather than a middle. An outlier is a value far from the rest; because the mean uses every number, an outlier can pull the mean up or down even when most of the data is unchanged.
  3. Using the Right WordUse statistical vocabulary correctly to describe data.Each term has its own job: mode = most common, median = middle, mean = fair share, range = spread, and outlier = a value far from the rest. Matching the right word to what you want to know is the foundation of describing data clearly.

Questions this course answers

The mode of a data set is:

The mode is the value that appears most often.

To find the median you first:

The median is the middle value once the numbers are sorted.

The range of a data set is found by:

Range = largest − smallest, a measure of spread.

An outlier is a value that:

An outlier lies far from the other values and can skew the mean.

Which average is the 'fair share' — total divided by how many?

The mean shares the total equally among all the values.

Grounded in trusted sources

  • Khan Academy — Math
  • BBC Bitesize — Maths
  • NCTM — Illuminations

Every Wunder lesson is built from real, reputable sources — never invented.

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