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Page Fault Doubt

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Consider the EMAT= PageFaultRate(PageFaultServiceTime + Memory Access)+(1-PageFaultRate)*MemoryAccess--->here the memory access time is considered after servicing a page fault

But if we expand the formula

EMAT=PFR(PFST) + PFR*MA +MA -PFR*MA--->so cancel out the terms

EMAT=PFR(PFST) + MA

Now if you solve the given question then answer will be 30ns.
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