How to determine total tolerance of a ceramic capacitor?
For a first order worst case analysis (WCA), you can assume that all tolerances are summed (stacked). The real complication occurs when you have multiple components. Since it often isn't obvious if positive or negative tolerance is worst case for each component, 10 components would require 1024 different analyses. Some automated simulations can be setup to calculate all possibilities. If absolute worst case doesn't pass, and redesigning is expensive, there are other techniques that assume that all parts won't have worst case errors at the same time. RSS (Root Sum Square) and Monte Carlo are 2 methods. Certainly for errors caused by temperature, parts on the same PWB will have similar temperatures, so it is unfair to assume that all will have worst case errors at the same time.

https://pdnotebook.com/statistical-tolerance-analysis-basics-root-sum-square-rss-632f2eb274ba