Thanks, Dan
Yes, that method eventually worked once I used a raster whose extent
matched the extent of my polygon. What I wasn't sure about was whether
the table would join correctly with the polygon. Happily it did.
Thanks,
Bob
Spatial analysis in ArcGIS Pro 2.4
-properly projected raster and surface extent to the polygon extent
-zonal statistics to table
-verify polygon layer projection = to raster projection
-join the table to the polygon layer
-check for problems