Appraisers can give a range of values, or a point value.
It depends on what the client wants. Several years ago it was common to give a range of value from the lowest possible opinion of value to the highest. It was done mostly for clients who wanted a potential sales price for a listing. They would look at the low end of the range as a quick sale price, and the high end would be considered the max that they could get. Over the years it has dropped from normal usage, as everyone nowdays seems to want as much money as they can get.