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Compute Var(760) if the distribution function of future lifetime at age 30 (that is, the number of years of life after age 30) is given

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Compute Var(760) if the distribution function of future lifetime at age 30 (that is, the number of years of life after age 30) is given by: F3o(t) = 1 - (1-t/70) 1/5 for 0 S t s 70 1 for t > 70 Show your derivation of the expression for variance of Ton in your PDF document while computation is to be performed in a spreadsheet

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