A process that is considered to be in control measures an ingredient in ounces. Below are the last 10 samples (each of size n = 5) taken. The population process standard deviation is 1.20.

Samples
1	2	3	4	5	6	7	8	9	10
9	13	14	11	13	9	9	13	8	11
10	12	8	11	11	10	11	11	9	11
11	13	10	10	8	8	11	7	12	9
9	14	10	9	11	11	7	10	13	8
12	11	8	9	11	10	10	7	10	12

a) Standard deviation of the sampling means = __?__ ounces (round your response to three decimal places).

Twelve samples, each containing five parts, were taken from a process that produces steel rods at Emmanual Kodzi's factory. The length of each rod in the samples was determined. The results were tabulated and sample means and ranges were computed. The results were:

Sample	Sample Mean (in.)	Range (in.)	Sample	Sample Mean (in.)	Range (in.)
1	9.900	0.033	7	9.901	0.041
2	9.904	0.041	8	9.905	0.034
3	9.889	0.034	9	9.893	0.027
4	9.908	0.051	10	9.901	0.029
5	9.895	0.031	11	9.901	0.039
6	9.901	0.036	12	9.904	0.047

For the given data, the x(=) = __?__ inches (round your response to four decimal places).