**Taming The Infinite/ Chapter 18/ How likely is that?**

What is the role of probability in all of this? In other words, what is the role of probability within mathematics? The theory of evolution is the perfect example of a theory that is based on probability and randomness. Statistics as well, the whole science is based on it, but it is nonetheless useful. A vivid example given in the book on why probability is useful is that of drug tests, were they require probability to further pursue medical research and application. Or, alternatively, if you see the use on it, you can mark the probabilities of getting heads 10 times in a row.