#### Statistical Glossary

**Weighted Mean (Calculation):**

To simplify calculation of the weighted mean , weights are often standardized to make their sum equal to the unit value, i.e. by dividing every weight by the total sum of all weights:

Then, the weighted mean is computed using weights , standardized according to the above expression, from the following formula:

See also: mean values (comparison) and the online short course Basic Concepts in Probability and Statistics