A data storage system consists of 3 disk drives sharing a common queue. An average of 50 storage requests arrive per second. The average time required to service a request is .03 second. Assuming that...

A data storage system consists of 3 disk drives sharing a common queue. An average of 50 storage requests arrive per second. The average time required to service a request is .03 second. Assuming that interarrival times and service times are exponential, determine:

a The probability that a given disk drive is busy

b The probability that no disk drives are busy

c The probability that a job will have to wait

d The average number of jobs present in the storage system