The probability that a process spends its time in performing I/O operations is 50%. In a multi programmed operating system environment, if there are 4 processes in memory at once, then the probability that all processes are waiting for I/O and the system utilization are respectively
1
¼, 54
2
(0.5)4, 1 – (0.5)4
3
5, 54
4
1/54, 1 – (0.5)4