At a bus stop, there are two buses available (bus numbers 1 and 2). For i = 1, 2, the waiting time until bus i arrives is denoted by T;, with T independent of T2, and T; has density function fr. (t) = X, exp(-1;t), t>0. You are waiting for either bus 1 or 2 to arrive. Let W denote the waiting time until you can get on a bus. ii. Show that E(W) < 1/max(\1, A2). (Hint: You need to work out E(T¡) and E(T-) first.) iii. Work out the probability density function of W. (Hint: Find P(W > w) first for w > 0.)

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