17. As you eat your way through a bag of chocolate chip biscuits, you observe that each biscuit is a circular disk with a diameter of 8.50 ± 0.02 cm and a thickness of 0.050 ± 0.005 cm. (a) Find the average volume of a biscuit and the uncertainty in the volume. (b) Find the ratio of the diameter to the thickness and the uncertainty in this ratio