The efficiency of this configuration is dismal—there are 9 page interrupts out of 11
page requests due to the limited number of page frames available and the need for
many new pages. To calculate the failure rate, we divide the number of interrupts by
the number of page requests. The failure rate of this system is 9/11, which is 82 percent.
Stated another way, the success rate is 2/11, or 18 percent. A failure rate this high
is usually unacceptable.