Outages in data centers are costly and can have serious business consequences in terms of lost revenue, lost customers, and lost brand loyalty. The outages are caused by power outage, IT systems, and the network. In a data-center, the number of outages over the last 12 months are recorded as follow:

Month	1	2	3	4	5	6	7	8	9	10	11	12
Number of outages	0	3	0	3	5	0	0	1	0	0	0	0

a. Construct a control chart (with 2-sigma limits) to help the data center check if they are experiencing too many outages. (Round your answer to three decimal places.)