thismeintiel on 31 July 2019
Figured I'd take the suggestion and make the actual averages, no consoles excluded. All figures are from Wikipedia (the majority of which are from financial reports), except Xbox consoles (as some weren't up to date), which are taken from VGC's Platform Totals.
SONY
ALL HOME CONSOLES - 447.89M across 4 consoles = 111.97M average
ALL HANDHELDS - 97M across 2 consoles = 48.5M average
ALL CONSOLES - 544.89M across 6 consoles = 90.82M average
NINTENDO
ALL HOME CONSOLES (includes Switch) - 317.75M across 7 consoles = 45.39M average
ALL HANDHELDS (includes Switch) - 466.94M across 6 consoles = 77.82M average
ALL CONSOLES - 747.82M across 12 consoles = 62.32M average
XBOX
ALL CONSOLES - 154.52M across 3 consoles = 51.51M average
