Blogger Blogs and PageRank

I'm curious about something. I've seen a lot of blogger blogs lately and I've noticed that for some reason very few, in fact hardly any, have any pagerank at all.

I've taken time to look at a lot of them and most are actually unranked... They're not even a zero. This in spite of the fact that many of them have a good number of inbound links and most of them are coming from ranked pages (values anywhere from 0 to 5, with the average being about 3)

I'm wondering, approximately how many links are required from sites with PR1 and above for a blogger site to gain a PR1 rank of it's own?

Filed in: blogs, page rank, links, inbound links, blogger blog