The manager of a local fast-food restaurant is interested in improving the service provided to customers who use the restaurant’s drive-up window. As a first step in this process, the manager asks his assistant to record the time (in minutes) it takes to serve 200 different customers at the final window in the facility’s drive-up system. The given 200 customer service times are all observed during the busiest hour of the day for this fast-food operation. The data are in the file P2_4.XLS.

a. Construct a frequency table and histogram for the distribution of observed customer service times.

b. Are shorter or longer service times more likely in this case?