My question is can someone who is not well educated (secondary school graduate) understand the statistics of bitcoin investment or Bitcoin trading?
Absolutely, there are no borders between how high or how low your education is in any investment, as long as you understand the risk associated into it.
You speak english very well, so there is no reason for you not to understand the different kind of price analysis, forecast, and Bitcoin related news in the internet.
Putting your money in Bitcoin doesn't require complex mathematical equations or scientific calculations.