Formula and method
Arithmetic mean = sum of all values ÷ number of values. Median is the middle sorted value.
Worked example
The average of 4, 8 and 12 is (4 + 8 + 12) ÷ 3 = 8.
Assumptions
- Values are weighted equally.
- Commas, spaces and line breaks may separate values.
Reference sources
Reviewed and updated 2026-07-14