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King County Department of Assessments

Fair, Equitable, and Understandable Property Valuations

Department of Assessments

500 Fourth Avenue,
Suite ADM-AS-0708,
Seattle, WA 98104

Office Hours:
Mon - Fri
8:30 a.m. to 4:30 p.m.

TEL: 206-296-7300
FAX: 206-296-5107
TTY: 206-296-7888

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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.