What is the reasoning behind setting the upper and lower control limits 303 from the mean? O A. The limits of the Z table are set at +30; OB. We know that 99.73% of natural variation is contained within + 307, and thus any data point outside of the limits is likely due to assignable variation O c. We know that 99.73% of assignable variation is contained within + 307; and thus any data point outside of the limits is likely due to natural variation OD. 95.45% of the time, the sample averages will fall within + 30, if the process has only natural variation