=+ 6 A utility has a department which does nothing but change the addresses of customers on the company’s information systems when customers move house. The process is deemed to be in control at the moment and a random sample of 2,000 transactions shows that 2.5 per cent of these transactions had some type of error. If the company is to use statistical process control to monitor error levels, calculate the mean, upper control level (UCL) and lower control level (LCL) for its SPC chart.