Probability and Statistics Cookbook by Matthias Vallentin.
From the webpage:
The cookbook contains a succinct representation of various topics in probability theory and statistics. It provides a comprehensive reference reduced to the mathematical essence, rather than aiming for elaborate explanations.
When Matthias says “succient,” he is quite serious:
But by the time you master the twenty-seven pages of this “cookbook,” you will have a very good grounding on probability and statistics.