How accurate and reliable is it to analyze people's personality according to their constellations and blood types?

In fact, these are all unknowns. In the west, when a person first comes to this world, the unknown of all celestial bodies at that moment determines his character. As upstairs said, he is a statistician. In the west, some professionals are engaged in the study of the relationship between constellations and human personality, and their surprise discovery accuracy rate has reached 75%. I believe that one day, these unrealistic things will be explained scientifically and completely. Including blood type, this is a similar situation! Finally, everyone is different and constantly changing. You can play with these things, don't be serious.