Princeton Manufacturing produces air conditioning units designed to maintain 46 degrees, Samples of 6 units are taken to monitor the process, ar is found that the units are maintaining 46 degrees as designed. The mean of the sample ranges is found to be 3 degrees. Construct an x chart. Step 2 of 3: Find the upper control limit for the control chart. Round your answer to three decimal places, if necessary: Princeton Manufacturing produces air conditioning units designed to maintain 46 degrees. Samples of 6 units are taken to monitor the process, and is found that the units are maintaining 46 degrees as designed. The mean of the sample ranges is found to be 3 degrees. Construct an x chart. Step 3 of 3: Find the lower control limit for the control chart. Round your answer to three decimal places, if necessary