Hi there, I have a pretty basic question on error analysis. say we want to obtain a quantity which is given by u+v. if u = 8.5452545 and has uncert 0.025454. it would be quoted as 8.55(2) and if v = 3.865898 and has uncert 0.04124343. it would be quoted as 3.87(4). but when calculating say u+v.... do i a) use 8.55 and 3.87 and their rounded uncertainties. or b) use the raw data? thanks for any help.