Answer from cs61c-cq (Shijie Li 15959617) for Question 1
The miss rate is misses / instructions. Since TLB sizes are typically much, much smaller than L1 caches, and TLB for instructions and data both for four-way set associative. and TLB misses are handled in hardware. then for the same misses, TLB's instrucions are far larger than L1 caches.