The following given is the 911 call data. a. Select the Run chart for the above data. Use five-minute intervals (i.e., count the calls received in each five-minute interval. Use intervals of 04,59, etc.). Note: Two or more calls may occur in the same minute; there were three operators on duty this night. Run Chart b. What can you conclude from the run chart? operators are required between 2:00 and 2:20 (bar closing time?)