Maximum Typical and minimum into datasheets. What is the distribution?
One important thing to add is that if you have a 1% resistor, it is not going to be normally distributed around for example, 100ohm.
In fact, you are almost guaranteed that it will not be 100.0 ohm as those are often binned out and sold as a higher tolerance.
It it not as simple as that though; supply/demand might persuade factories to supply 0,1% resistors into the 1% resistor supply chain, etc.
So to answer your question; You don't know the distribution, and you should always assume the worst.