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Cabinet members of cabinet-level federal departments are chosen directly by the president

Indicate whether the statement is true or false

A waiting line meeting the assumptions of M/M/1 has an average time between arrivals of 20 minutes, and it services items in an average of 10 minutes each. What is the utilization factor?

A) 0.25 B) 0.33 C) 0.50 D) 0.67 E) 3.00