Question: A laminated item is composed of five layers. The layers are a simple random sample from a population whose thickness has mean 1.2 mm and

A laminated item is composed of five layers. The layers are a simple random sample from a population whose thickness has mean 1.2 mm and standard deviation 0.04 mm.

a. Find the mean thickness of an item.

b. Find the standard deviation of the thickness of an item.

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