Your first query is performed on a polygon layer (determined from the Map Service description at https://enviroatlas.epa.gov/arcgis/rest/services/National/ESN_CleanAir/MapServer/21). The input polygon rings intersect with 2 geometries. Add * to the Out Fields option to get the rest of the record field values like this example and the results for the MeanPrecip field can be used.
Your second query with the error is performed on a raster layer. This is most probably the layer on which the zonal statistics for each parcel was based. You could do an Identify operation on this layer and look at the resulting "Pixel Value" field, although this will only return the result for a single pixel and not the average (or whatever statistic) for the selected parcel.
