Question $3$

A data storage system consists of $3$ disk drives sharing a common

queue. An average of $22$ storage requests arrive per second. The

average time required to service a request is $0\mathrm{.}044$ second. Assuming

that interarrival times and service times are exponential, what is the

average number of request spends waiting in line $(L_q)?($three

decimals$).$