process schdeuling

Question

The IO wait percentage w of a process is the percentage of time the process wait for an IO to completion when executed in a monoprogramming enviorment . on a system using round robin with n process ,all having same IO . what percentage of time cpu will be idle in term of (w) ?

Comments

Without execution time of each process and without knowing execution time greater or less than io ,how could it be done?

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Even i dont know :( They havent specified anything. i supposed it is derivation

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When it is monoprogramming environment i.e. only one process sits till its completion in memory then why we use scheduling ?