The operations manager of a toll booth located at a major exit of a state turnpike is trying to estimate the average 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 average 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. The data are provided in the file P2_9.XLS. Choose a simple random sample of size 20 from the given frame of 365 values to help the operations manager estimate the average throughput value.