Question: For a single - server CPU, where jobs arrive according to some process, let SRPT denote the preemptive scheduling policy that always serves the job

For a single-server CPU, where jobs arrive according to some process,
let SRPT denote the preemptive scheduling policy that always serves the
job with the currently Shortest-Remaining-Processing-Time (assume one
knows this information). It is claimed that for any arrival sequence, consisting
of the arrival time and size of every job, SRPT scheduling minimizes
mean response time over that arrival sequence. Prove or disprove this
claim.

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