
What is the normal open ratio for emails?

I have an interesting challenge now. Probably the next learning curve. There are 13 subscribers to my Dynamic eBusiness Building site. I have sent out a few emails this week, a few just useful information that I learnt and then a few with a product promotion.
People are not opening my emails. Only one person per campaign is opening the mail. This is about a 10% Open Ratio on the current list size. Is this normal?
Here are the email subjects that I used:
1) Yes, you can create a new online business within 24 hours
2) This is the most important thing you will read
3) Andy Fletcher spills his super-secret SEO strategy - Free
4) It's not about you
5) All you need is a tough teacher
Are they awful subject lines? Any advice would be appreciated.
Thanks
Di
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