In a subway station, there are exactly enough customers on the platform to fill three trains. The arrival time of the nth train is Xi+..+X, where X1, X2... are iid exponential random variables with E[X]-2 minutes. Let W equal the time required to serve the waiting customers. We are interested in estimating the probability that W is greater than 20 min. For that Use: 1. The central limit Theorem 2. The Markov Inequality The Chebyshev Inequality 3. Compare and comment on the various obtained results

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