The expert wants to build 3-sigma control limits for an experiment. The mean of the experiment is 12 units, and the standard deviation of the experiment is 6. If samples of size 16 are to be taken, the LCL and UCL will be, Answer Choices: a. 7.5 and 16.5 b. 16.5 and 7.5 c. 6.5 and 15.5 d. 14.5 and 4.5

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