Customers have complained about long check-in time at the Daddy Yankee Hotel. Manager Rauw Alejandro started studying the process by measuring check-in time using a sample of 4 check-ins per day over a period of 30 days. An excerpt of that data, consisting of the first 5 days of data, are shown below.

	Observations
	1	2	3	4
Day 1	6.01	4.28	7.32	7.03
Day 2	5.77	8.22	2.3	4.11
Day 3	7.02	7.72	6.45	6.57
Day 4	5.9	8.12	7.12	6.7
Day 5	6.9	4.96	4.85	6.21

Rauw would like your help in identifying what control chart(s) to use.

1. Please identify and report the type of control chart(s) that would be appropriate if only this data is available, and provide a one-sentence justification for the same.
2. Describe how you would go about calculating the Center Line(s) for the control chart(s).