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What does ‘b’ represent in a processor wait ratio?

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What does ‘b’ represent in a processor wait ratio?

(a) input ratio

(b) output ratio

(c) average time

(d) average I/O time

This question was addressed to me in an online quiz.

This intriguing question originated from Multiprogramming topic in chapter Operating Systems of Computer Fundamentals

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Correct choice is (d) average I/O time

To explain I would say: It represents the average I/O time. Average execution time with single programming is given by e.

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