- #1

Hi.O303

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## Homework Statement

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 8.5 +/- 0.02 cm and a thickness of 0.050 +/- 0.005 cm.

Find the ratio of the diameter to the thickness and the uncertainty in this ratio.

## Homework Equations

## The Attempt at a Solution

So what I did was just put 8.50 +/- 0.02 cm divided by 0.050 cm. My answer was :

170 +/- 4cm

Their answer was : 170 +/- 20 cm.

So I see where they got the 170 from, but I'm not sure why they 20cm is there.