We will find out about the Black Plague and the chance of survival of the Black Plague.
We will find how many people survived the Black Plague. We will also figure the how many people were alive before the Black Plague.
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It matters what job you have If you have the rat catcher job most of the people will get the disease and die.
75 million people died from the Black Plague. It killed 50% of the population so if we multiply 75 by two we would get 150 million. So 150 million people lived before the Black Plague. Also we know that 75 million survived the Black Plague.