(a) A lire station is to be located along a road of length A,A < ∞. If fires occur at points uniformly chosen on (0, A), where should the station be located so as to minimize the expected distance from the fire? That is, choose α so as to minimize E[|X – a|] when X is uniformly distributed over (0,A).
(b) Now suppose that the road is of infinite length-stretching from point 0 outward to ∞. If the distance of a fire from point 0 is exponentially distributed with rate λ, where should the fire station now be located? That is, we want to minimize E[|X – a|], where X is now exponential with rate λ.
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