Examine the Statistical Process Control outputs. Four items are randomly selected and measured for each sample. The measurements for five samples are shown in the following Table.

	Item 1	Item 2	Item 3	Item 4
Sample # 1	12.2	12.6	12	12.1
Sample # 2	11.9	12.5	12.4	12.7
Sample # 3	12	12.2	12.9	13.1
Sample # 4	13	12.5	14	12.8
Sample # 5	12.2	12.8	12.7	12

Based on the data from Exhibit C, if we want to construct the 3-sigma control limits for mean chart, what are the LCL and UCL?

Select one:

a. 12.00 and 12.85

b. 11.55 and 13.30

c. 8.83 and 16.03

d. 11.83 and 13.23

e. 11.89 and 12.96