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

1.64.

Samples
1	2	3	4	5	6	7	8	9	10
10	13	12	11	13	10	10	13	9	9
9	12	10	9	11	9	12	16	8	11
11	12	10	12	8	7	9	8	11	9
10	14	9	11	12	12	7	10	12	8
13	11	8	11	9	10	8	7	10	12

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

b) Based on the 10 samples taken, x =_____ ounces

c) With z=3, the control limits for the mean chart are: UCLx = ______

d) LCLx = _____