A laminated item is made up of six layers. The two outer layers each have a thickness

Question:

A laminated item is made up of six layers. The two outer layers each have a thickness of 1.25 ± 0.10mm and the four inner layers each have a thickness of 0.80 ± 0.05 mm. Assume the thicknesses of the layers are independent. Estimate the thickness of the item, and find the uncertainty in the estimate.