Nope, they are all calculated and are quite accurate.
A normal person can't even begin to deal with the numbers they work with, which is why folks like yourself believe they are just bull ******** us. Well, that or religion.
That is truly shocking. this is why the idea and rules of science need be taught more at school.
Please tell me what the average life ratio is per million planets, then the average intelligence Is per billion life supporting planets is. Please tell me what life can be based on, carbon, silicon, other. Please tell me how many planets are in the sweet spot away from the sun and what that sweet spot is.
Quite simply they have plugged more or less random numbers into an equation. We haven't got a first clue about most of the variables.
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