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—In the study of the reliability of technical systems,-out-of-systems play an important role. In the present paper, we consider a-out-of-system consisting of identical components with independent lifetimes having a common distribution function. Under the condition that, at time , all the components of the system are working, we propose a new definition for(More)
In this paper we summarize some recent results on mean residual lifetime (MRL) and the mean past lifetime (MPL) of a k-out-of-n structure at the system level. In section 2, it is assumed that in a k-out-of-n system all the components of the system are working at time t. Under this condition, the MRL of the system is de…ned and several properties of that are(More)
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