In a subway station, there are exactly enough customers on the platform to fill three trains. The arrival time of the nth train is X+.+X, where X1, X2... are iid exponential random variables with...

Extracted text: In a subway station, there are exactly enough customers on the platform to fill three trains. The arrival time of the nth train is X+.+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 Compare and comment on the various obtained results 3. 4.