My question is can someone who is not well educated (secondary school graduate) understand the statistics of bitcoin investment or Bitcoin trading?
If you try, you can do it. You don't need higher education. You just need to learn about it specifically and devote yourself to it. Learn the basics first. When the advance knowledge comes up, and you can't understand it, just google it or YouTube. Or, the best option is to ask in this forum. There are many people always ready to help you.
And if you want to get into trading, it's simple yet hard, because you need to understand the concept of price chart and how the price moves. Practice makes you perfect. Learn and try. You will become a pro one day, for sure. You just need to keep going and not give up.
You should also educate yourself about risk management strategies, such as setting stop-loss orders and diversifying your investment portfolio. Don't invest all your money in one trade. But these are some knowledge that you need to know after you enter the platform. Take the first step and as you move forward, you will learn it eventually.