A server operates with $90\%$ utilization.$$ Coefficient of variation of service process is $0\mathrm{.}6.$ Coefficient of variation of arrival process is $0\mathrm{.}8.$ Average processing time is $4$ minutes.$$ What is the average time a customer spends in the system using the single server queuing model $?$ Show all formulas used, calculations and results. Type on Canvas. Do not cut and paste or do screen shots

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