can someone who is not well educated (secondary school graduate) understand the statistics of bitcoin investment or Bitcoin trading?
The three important skills to develop above all things in school is how to read, how to write and how to understand. Once you can do these, you are very qualified to be trading bitcoins or be very involved with it. Some people devoted time to learning about bitcoins and you can too with your little education. You just need resources that you can devote time to reading and a guide or a community that you can take questions to whenever you have to ask. The most educated are not the most successful in bitcoins, bitcoin requires another form of education.
This is true, only a person who can read, write and understand can invest in bitcoin. Knowledge to invest bitcoin as well as how to succeed in investing, school does not teach us that. High or low level of education is not an issue with bitcoin investing. OP can comfortably invest in bitcoin without having to worry about his education.