A five-gear assembly is put together with spacers between the gears. The mean thicnkess of the gears is 5.03 cm with a standard ev. of .008. the mean thickness of the spacers is .140 cm with a standard dev. of .005. Find the mean and standard deviation of the thickness of the assembled units consisting of five randomly selected gears and four randomly selected spacers. I am kind of confused on where to even start since I dont truly understand what the problem is asking.