The length of time (in years) until a copier feed mechanism needs to be replaced has probability

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The length of time (in years) until a copier feed mechanism needs to be replaced has probability density function given by f(t) = 0.6 e-0.6t t ≥ 0

If one of these copiers is selected at random, find the probability that this mechanism lasts

(a) more than 3 years.

(b) more than 3 years given that it lasts more than 1 year.

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