Given mu and sigma of a normal distribution, how to find min and max?

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normal distribution of mu=0, sigma-0.02

I am trying to calculate the min and max values for Gaussian noise where mu=0 and sigma=0.02. It looks like it is 0.08 and -0.08 from the picture from https://homepage.divms.uiowa.edu/~mbognar/applets/normal.html but what is the math behind it?