The time between successive arrivals of vehicles at a toll booth were observed as follows:" 1.2, 3.0, 6.3, 10.1, 5.2, 2.4, and 7.1 sec If the inter-arrival times of vehicles at the toll booth are modeled with an exponential distribution with a PDF of 1 fr(t) =e" in which 2 is the parameter of the distribution and is also the mean inter-arrival time.

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