Hello EllenDean I've been in hubpages for 4 weeks now published 21 hubs and my current score is 90. However I've seen other people who have been here for ages and are still well under 50..
I think the score is affected by:
The traffick of your hubs
The number of hubs you published
The rating of your hubs
The number of people who follow you
Your activity on the page following people, answering questions, posting in the forum, posting comments rating hubs etc
And if you had any people to subscribe to hubpages following a link of yours