Question: A machine part is assembled by fastening two components of type A and one component of type B end to end. Suppose that the lengths

A machine part is assembled by fastening two components of type A and one component of type B end to end. Suppose that the lengths of components of type have an expectation of 37.0 mm and a standard deviation of 0.7 mm. whereas the lengths of components of type B have an expectation of 24.0 mm and a standard deviation of 0.3 mm. What are the expectation and variance of the length of the machine part?

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