Many retailers and grocers, like Target and Walmart, have started using self-checkout registers instead of standard checkout registers. Retailers staff a group of self-checkout registers with a single employee to help with problems and monitor the check out process rather than having a 1 to 1 ratio of employees to standard checkout registers. According to a study completed by the University of Leicester in 2016, self-checkout registers nearly double the shoplifting rate from approximately 2% to approximately 4%. As 1/3 of sales come from shoppers in the self-checkout lanes, this increase is substantial. Suppose you are helping a retailer decide whether or not to install self-checkout registers in their stores. This retailer is not only deciding whether or not to use self-checkout registers, but also if they decide to change, how many registers should be assigned to each employee for monitoring and assistance. Use the data reference cells provided below and the concepts learned to complete the following tasks and make a decision.