Consider a demand paging system with four page frames (initially empty) and LRU page replacement policy. For the following page reference string:
\[
7, 2, 7, 3, 2, 5, 3, 4, 6, 7, 1, 5, 6, 1
\]
The page fault rate, defined as the ratio of the number of page faults to the number of memory accesses (rounded off to one decimal place) is \(\underline{\hspace{1cm}}\).
