Statistics & Probability

Mean

The arithmetic average. Sum of values divided by the number of values.

Definition

For a list: mean = (sum of values) ÷ (number of values). For a frequency table: sum of (value × frequency) divided by total frequency. For grouped data: use midpoints.

Example

Mean of 4, 6, 7, 9, 14: (4 + 6 + 7 + 9 + 14) ÷ 5 = 8.

Used in these topics

Mean, median, mode and range →

Related terms

Median

The middle value when the data is sorted in order. For an even count, average the two middle values.

Mode

The value that appears most often. A data set can have one mode, more than one (bimodal), or no mode.

Range

A measure of spread: largest value minus smallest value.

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