A process considered to be in control measures an ingredient in ounces. A quality inspector took 10 samples, each with 5 observations as follows:

Samples	Observations
	1	2	3	4	5
1	10	9	10	9	12
2	9	9	11	11	10
3	13	9	10	10	9
4	10	10	11	10	10
5	12	10	9	11	10
6	10	10	8	12	9
7	10	11	10	8	9
8	13	10	8	10	8
9	8	8	12	12	9
10	10	12	9	8	12

1. Using this information, obtain three-sigma (i.e., z=3) control limits for a mean control chart and control limits for a range chart, respectively. It is known from previous experience that the standard deviation of the process is 1.36.
2. Discuss whether the process is in control or not.