There is no definite answer to this question. In other words - your question has no answer, and thus can not be answered with any degree of truth, or validity.
Nowadays hubs start off with a lower score...or a higher score than they once did.
It used to be that hubs always started at a score of 50. Now, hub's start off with a score based upon the chosen title and subject manner - according to the hubpages scoring algorithm.
Now, if you work on your hubs more slowly as I do - you will indeed see that as you add text, pictures, or other capsules - those scores will rise with time.
I've published hubs starting below 50...because I was just ready to get it done and got it done, and hit publish.
I've also published hubs that started out at a score of around 75 - that was only due, the high score, to the fact that the title or subject matter was totally unique to Hubpages.com, and probably a rare subject matter all across the world wide web.
Don't be fooled - my hub on Russ Barenberg started it's life with a high score - because the subject was obscure, NOT because it's going to ever be a huge money making internet search engine loved viral subject.