# Uncorrelated uncertainties

1. Jan 29, 2009

### bocobuff

1. The problem statement, all variables and given/known data
For uncorrelated uncertainties $$\delta$$ x and $$\delta$$ y give the values and uncertainties for W in standard format.
A.) W=x+y with x=4.2(0.2) and y=0.7(0.1)

2. Relevant equations

3. The attempt at a solution
well i think i am supposed to take the partial derivatives of W with respect to x and y (dW/dx and dW/dy) which both =1. Then is the total derivative DW/DXorY = 1+1 dx/dy? Or do I only use the derivatives for the uncertainties and just plug x and y, 4.2 and 0.7, into W?

Last edited: Jan 29, 2009