what is the cpu utilization?

Question

In a system having a 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 1

in 1 min 6 processes is coming and each takes 7 sec .

so in 60 sec total 42 sec time are busy .

so utilization is 42/60 *100 = 70% .