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A system consisting of one original unit plus a spare can function for a random amount of time X. If the density of X

A system consisting of one original unit plus a spare can function for a random amount of time X. If the density of X is given (in units of months) by f(x) = Cxe-x/2 x > 0 x 0 what is the probability that the system functions for at least 5 months?

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