4) (20 points) A call center wants to measure the waiting time of their operators in responding their customers' requests. Listed below is the time recorded in minutes from five different samples and the business does not accept the case in which a customer waits on the line more than 2.5 minutes (i.e., >2.5 min is not accepted). Determine whether the process is in control by considering the following table. If necessary, state any assumptions you made. Sample Observations 1 23 3 4 5 2 3432 6 5 2 1 8.4 1.5 4 3 3 5.5 3 2.8 2 1.9 7 3.1 3 1