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Rib5

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I was reading about monte carlo analysis in the introduction from a textbook, and they gave an example of a voltage divider. They assumed resistor values had an equal probability of having values between the two tolerances. I know this is a simplistic assumption and I was wondering what kind of distribution resistors really follow.

I am guessing that it is most likely a gaussian distribution, but just wanted to know if that is specified somewhere. What does +-5% really mean? Is it that 90% of the resistors will be within those bounds? or does it have to do with standard deviation?