It’s important to remember that these are just averages. Individuals have, well, individual results. It has always amused me that my husband, who has an M.S. in Engineering, can’t mentally rotate his way out of a paper bag, whereas I always aced the spacial rotation tests (as did my mother, an artist).
Aargh. Spatial. Not “spacial.” (Maybe I’m kind of “special” myself tonight! LOL!)