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 1.36.

Samples:

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

a. What is x? [ Select ] [".76", ".61", "1.36", "1.27"]

b. If z = 3, what are the control limits for the mean chart? [ Select ] ["11.51 and 8.56", "11.83 and 8.17", "12.56 and 9.67", "11.34 and 8.17"]

c. What are the control limits for the range chart? [ Select ] ["7.45 and 0", "8.78 and .07", "6.96 and -.008", "6.98 and 0"]

d. Is the process in control? [ Select ] ["only 1 data point is out of control, so it is still acceptable", "yes", "cannot determine from the data", "no - sample 3 and 8 are out of control"]