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  1. (D - M) / (X - M)

  2. (X - M) / (D - M)
  3. (D - X) / (D - M)
  4. (X - M) / (D - X)
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1 Answers

Option 2 : (X - M) / (D - M)

Let P be the page fault rate.

Average memory access time = ( 1 - page fault rate) × memory access time when no page fault  +  Page fault rate × Memory access time when page fault.

X = (1 - P) × M + P × D

∴X = M - PM + PD

X - M = P(D - M )

P = (X - M)/( D - M)

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