Hello, If possible please give me a detailed explanation of how to solve the problem

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7. Assume the time S in between any two customers arriving to an automobile service facility can be modelled as an exponential random variable with parameter . So, we are talking about the interarrival time between two customers, on one hand, and the fact that the distribution function of S is Fs(t)=1et a. [10 points] What is the probability that the time between any two consecutive customers arriving to the facility is more than s units of time