Question: A grocery store has three open checkout lanes. On average, 45 shoppers arrive at these lanes per hour. The coefficient of variation of the interarrival

A grocery store has three open checkout lanes. On average, 45 shoppers arrive at these lanes per hour. The coefficient of variation of the interarrival time is equal to 1. The average service times for all the lanes is 18 customers per hour, and the coefficient of variation of service time distribution for all three lanes is three minutes. What is the percentage decrease in utilization when one more checkout lane is added to the system?

a.62.5%

b.50%

c.25%

d.15%

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