What is the reasoning behind setting the upper and lower control limits + 30; from the mean? O A. 95.45% of the time, the sample averages will fall within = 30; if the process has only natural variation OB. We know that 99.73% of natural variation is contained within 1 30;, and thus any data point outside of the limits is likely due to assignable variation OC. We know that 99.73% of assignable variation is contained within 1305, and thus any data point outside of the limits is likely due to natural variation OD. The limits of the Z table are set at +30%