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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
In Self-Test Problem 5, how many components would one need to have on hand to be approximately 90 percent certain that the stock will last at least 35 days?
Problem 5
The amount of time that a certain type of component functions before failing is a random variable with probability density function
f(x) = 2x 0
Once the component fails, it is immediately replaced by another one of the same type. If we let Xi denote the lifetime of the ith component to be put in use, then
represents the time of the nth failure. The long-term rate at which failures occur, call it r, is defined by
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Assuming that the random variables Xi, i ≥ 1, are independent, determine r.
Â
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