The useful life of a car battery t (in years) is given by the probability density function

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The useful life of a car battery t (in years) is given by the probability density function f (t)=0.2e-0.2t, t ≥ 0 Find the probability that a battery chosen at random lasts
(a) 2 years or less.
(b) Between 4 and 6 years.
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