If you have ever come across Bayes’ theorem, chances are you know it’s a mathematical theorem. This theorem has a central role in probability theory. It’s most commonly associated with using evidence for updating rational beliefs in hypotheses. While this post is not about listing its real-world applications, I am going to give the general gist for why it has such potential in the first place.
Imagine that one morning, during a rainy season, you’re wondering whether to take an umbrella with you before you leave your house. You look outside your window to see that the weather is currently sunny. So, your first thought is that rain is unlikely.
more: http://www.probabilisticworld.com/what-is-bayes-theorem/