My question is can someone who is not well educated (secondary school graduate) understand the statistics of bitcoin investment or Bitcoin trading?
By saying "well educated", that means the person has a little form of education to start with. With little education of knowing how to read and write, anyone can venture into anything they're ambitious to do. What matters is the willingness to learn new things. Most of us here didn't have an iota of idea what Bitcoin was until we stumbled on this forum. I know a few who now teach others. So, start by learning the basic stuff about Bitcoin and you will be surprised how much more you will get exposed to. Don't let your lack of a tertiary education debar you from going into Bitcoin investment.