Question

A computer system has a cache hit ratio of 95%, a cache access time of 5 ns, and a main memory access time of 80 ns (charged only on a cache miss). What is the average memory access time for this system?

A 80 ns
B 9.75 ns
C 42.5 ns
D 5 ns
E 8.75 ns
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RBI Grade B 2026 Phase 1 Memory Based Paper
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