Cramér's theorem (large deviations)

Cramér's theorem (large deviations) is a mathematical formula that tells you the probability of an event happening. For example, if you've flipped a coin 1000 times, and it comes up heads 600 times, Cramér's theorem (large deviations) tells you how likely it is for that to happen. It does this by taking into account how many times you flipped the coin and how many times it came up heads. The higher the number of flips, the more accurate Cramér's theorem becomes.