what is the meaning of "confidence level"in property valuation.?

Answer 1

This sounds like an Automated valuation of value! the level would depend on similar or like properties in the zip code that sold in the last year. Low indicates not sure at all. High indicates many were sold and should be realistic value. The only way for sure is to have an appraisal done by an appraiser who is familiar with the market

Answer 2

It's a measure of how confident you are in the appraisal. Usually there is an upper 95% and lower 95% confidence levels, so you can be pretty sure the real value is between those two.