What is the difference between a big-endian and little-endian data representation? If we want an average memory access time of 6.5 ns, our cache access time is 5 ns, and our main memory access time is 80 ns, what cache hit rate (h) must we achieve? Use the formula below to calculate the average memory access time as a sum of the cache access time and the main memory access time. tav = h* tcache + (1 h) * tmain