Unformatted text preview: N = inf { n ≥ 1 : X n ≥ c } mark the ﬁrst interarrival time of length at least c . As soon as the previous car has passed you cross the road and arrive to the other side at time T = S N1 + c . Find E ( T ) in terms of the two parameters of the model, p and c . If you use Wald’s identity, be sure to check its hypotheses. After you found an answer, try to check that it makes sense. For example if c = 1 the answer should be pretty obvious. Does your formula give the right answer?...
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 Spring '11
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 Wald, Stochastic Processes Fall, pq k1

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