The operations manager of a toll booth, located at a major exit of a state turnpike, is trying to estimate the typical number of vehicles that arrive at the toll booth during a 1-minute period during the peak of rush-hour traffic. In an effort to estimate this typical throughput value, he records the number of vehicles that arrive at the toll booth over a 1-minute interval commencing at the same time for each of 365 normal weekdays. These data are contained in the file P2_9.XLS.

a. Find the most appropriate measure of the given distribution’s central location.

b. Is this distribution of arrivals skewed somewhat? Explain.