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1 5 points In a single server system, the server operates with 60% utilization. The coefficient of variation for the service process is 0.5 and the coefficient of variation of the arrival process is 15. The average processing time is 3 minutes. The average waiting time a customer spends in line is minutes. (Round off your answer to the FIRST decimal point) (Difficulty Level - Hard) Type your answer. Which of the following aims to reduce the average waiting time? (Difficulty Level - Hard) There may be more than one correct choice. Select All that apply. Shifting demand from high-demand periods to low-demand periods. Use a multiple line layout in a multiple-server system. Accept limited number of customers each day. Provide free wifi in the waiting room. Leave more buffer capacity in the system