I need every excel formula for this table. With every detail posible of how you completed it.

2) Suppose there is a one service center consisting of a single server. Let the external arrival process be Poisson with rate , the service times be exponential with mean service-time 1/. The interarrival times (time between arrivals) and the service times of 20 customers have been recorded and they are shown in the table below; the other columns in the table can be calculated based on these two pieces of information. For example, the "Arrival time" for the second customer is the arrival time of the previous customer plus the time between the first and the second customer (18.6+12.7=31.4). When this second customer arrives, the server is idle (since the first customer left at time 19.1) and, consequently, his service begins immediately (at his arrival time =31.4 ); if the server had not been idle he would have to wait for the previous customer to leave the system. The second customer ends his service (and leaves the system) at time 40.9 , since he started his service at time 31.4 and his service took 9.6 time units. Thus, she spent 40.931.4=9.6 time units in the system