Find the uncertainty?

Question

As you eat your way through a bag of chocolate chip cookies, you observe that each cookie is a circular disk with a diameter of 8.50 +- 0.02 cm and a thickness of 0.050 +- 0.005 cm. Find the uncertainty of the ratio of the diameter to the thickness.

Answer 1

The range of uncertainty is minimum ratio to maximum ratio.
min ratio = min diam/max thick
max ratio = max diam/min thick
You should be able to go from here.