A certain memory configuration has four levels M1 , M2 , M3 and M4 with hit ratios of 0.7, 0.85, 0.97, 1.0 respectively. A program P makes 3000 references to this memory system. Calculate the exact...

A certain memory configuration has four levels M1 , M2 , M3 and M4 with hit ratios of 0.7, 0.85, 0.97, 1.0 respectively. A program P makes 3000 references to this memory system. Calculate the exact number of references Ri made by P to each level of memory, Mi.