At a smelter the CrO3 content of a chromium ore reference sample is analysed every day. Over a period of 26 months this reference samples was analysed 780 times and has a population median of 44.6, average of 45.1 and standard deviation of 0.9% CrO3. Determine the upper (UCL) and lower control limit (LCL) values that should be applied on a quality control chart.