Consider a demand paging system with four page frames (initially empty) and…

Consider a demand paging system with four page frames (initially empty) and LRU page replacement policy. For the following page reference string

                7, 2,7,3, 2,5,3, 4,6,7,7,1,5,6,1

the page fault rate, defined as the ratio of number of page faults to the number of memory accesses (rounded off to one decimal place) is_________.