It is usually a mediocre number of views but this is very relevant to how long the hub has been published. A decent number of views per hub is usually between 40 to 60. The second question is the views do include your own and any from HubPages.
Also the number of views is not necessarily a solid predictor of how much you will earn from any ad source. This is mostly dependent on the time of day, the day itself, when your share of add time is posted, the value of adds or CPM and so on.