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**1. The problem statement, all variables and given/known data**

I am doing percent difference of 2 values.

value 1 = .013329 +- .001 cm

value 2 = .013331 +- .001 cm

So, for percent difference I do:

.013331 - .013329 / ((.013331 + .013329)/2)

gives me .015%, but what would my uncertainty be? I don't wuite understand. Thanks!

**2. Relevant equations**

**3. The attempt at a solution**