A hospital conducted a study of waiting time in its emergency room. The hospital has a main campus and three satellite locations.Management had a business objective of reducing waiting time for emergency room cases that did not require immediate attention. To study this, a random sample of 15 emergency room cases at each location were selected on a particular day, and the waiting time(measured from the check in to when the patient was called into the clinic area) was measure. The results are in the table below.