King County Department of Assessments

Setting values, serving the community, and promoting fairness and equity.

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Glossary of terms for residential parcels

WEIGHTED MEAN RATIO
	Sum of the appraised values divided by the sum of the sales prices, which weights each value in proportion to its sale price. It is a better reflection of the sample than the arithmetic mean.
WEIGHTED MEAN; WEIGHTED AVERAGE
	An average in which each value is adjusted by a factor reflecting its relative importance in the whole before the values are summed and divided by their number.