Measurements of a certain system have shown that the average process runs for a time T before blocking on I/O. A process switch requires a time S, which is effectively wasted (overhead). For round-robin scheduling with quantum Q, give a formula for the CPU efficiency for each of the following:
(a) Q = ∞
(b) Q > T
(c) S < Q < T
(d) Q = S
(e) Q nearly 0