ISRO | ISRO CS 2011 | Question 76

In a system using single processor, a new process arrives at the rate of six processes per minute and each such process requires seven seconds of service time. What is the CPU utilization?
(A) 70%
(B) 30%
(C) 60%
(D) 64%

Answer: (A)
Explanation: Number of processes per minute = 6
Burst time of each process = 7 secs

CPU utilization time within a minute = 6*7 = 42 secs
% CPU utilization = useful time / total time * 100
                  = (42/60) * 100 
                  = 70%

Option (A) is correct.
Quiz of this Question