Suppose that components are manufactured such that their heights are independent of each other with =

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Suppose that components are manufactured such that their heights are independent of each other with μ = 65.90 and σ = 0.32.
(a) What are the mean and the standard deviation of the average height of five components?
(b) If eight components are stacked on top of each other, what are the mean and the standard deviation of the total height?
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