••• F.19 A nail salon is deciding if appointing an additional manicurist will be financially feasible. Today, the nail salon has three manicurists, only one of whom is by appointment and the other two for drop-in sessions. The following tables summarize the various durations of time in a session and the time intervals between arrivals of customers, respectively:

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TIME 30 45 60 75 90 PROBABILITY 0.1 0.2 0.4 0.2 0.1 TIME 10 20 30 45 50 PROBABILITY 0.1 0.2 0.4 0.2 0.1