I am new to Hubpages and still learning how things work but I do not think there is an average number of page views.
My experience on the internet say there is no average. But you can strive for a certain number. What is your goal. Money? Followers? Comments?
Rather than think of average views look at which of your articles gets more views and comments. Then figure out why.
It seems like your follower base is also really important. So many hubs are written that your articles will fall off the featured list rather quickly.
These are things I have noticed but am curious what other people say. I still have so much to learn.