Question: Manager wants to build 95%-level X bar control limits for a process. The target value for the mean of the process is 12 units, and

Manager wants to build 95%-level X bar control limits for a process. The target value for the mean of the process is 12 units, and the standard deviation of the processes is 8. If 16 samples of size 9 are to be taken, what will be the upper and lower control limits respectively?
a. 15.28 and 8.71
b. 14.46 and 9.53
c. 13.28 and 6.71
d. 16.38 and 7.61
e. 12.46 and 7.53

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