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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
18.      After being repaired, a machine functions for an exponential time with rate λ and then fails. Upon failure, a repair process begins. The repair process proceeds sequen- tially through k distinct phases. First a phase 1 repair must be performed, then a
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phase 2, and so on. The times to complete these phases are independent, with phase
i taking an exponential time with rate μi , i = 1, ... , k.
(a)Â Â Â Â Â What proportion of time is the machine undergoing a phase i repair?
(b)Â Â Â Â Â What proportion of time is the machine working?
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