Standard Deviation Problem in Physics. Help!? 1. The problem statement, all variables and given/known data In working with Wheatstone bridge one student chose the value for R1 so that the bridge is balanced at L1 = 48.5 cm and L2 = 51.2 cm. If Each measurement has an uncertainty of +/- .05, what would be the minimum value for the uncertainty in the calculation of Rx? Given Equation: Rx = (L2/L1)*R1 3. The attempt at a solution I know that R1 can be eliminated when looking at this question. However, my main concern is how to find the deviation using the Division rule? I have been exposed to several methods of finding the deviation. It confuses me a lot! My guess is that, regardless of the sign (multiplication, division, subtraction, addition), the deviation +/- .10 . it's just a sum of the two .05 uncertainties in measurements. I just need confirmation. I don't want to end up screwing up this problem...It's kind of a crucial step for the next few problems. Thanks for any help I can get!