A weighted mean is a mean in which each quantity to be averaged is assigned a weight. These weightings determine the relative importance of each quantity on the average. Weightings are the equivalent of having that many like items with the same value involved in the average.
Let's take the value of letter tiles in the popular game Scrabble.
Value: 10 8 5 4 3 2 1 0
Occurrences: 2 2 1 10 8 7 68 2
Calculate the mean of the value of a letter.
Click on 'wμ' and you have the answer : 1.87.
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