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Mixed systems with minimal and maximal lifetime variances

Author

Listed:
  • Marek Beśka
  • Krzysztof Jasiński
  • Tomasz Rychlik
  • Marcin Spryszyński

Abstract

We consider the mixed systems composed of a fixed number of components whose lifetimes are i.i.d. with a known distribution which has a positive and finite variance. We show that a certain of the k-out-of-n systems has the minimal lifetime variance, and the maximal one is attained by a mixture of series and parallel systems. The number of the k-out-of-n system, and the probability weights of the mixture depend on the first two moments of order statistics of the parent distribution of the component lifetimes. We also show methods of calculating extreme system lifetime variances under various restrictions on the system lifetime expectations, and vice versa. Copyright The Author(s) 2012

Suggested Citation

  • Marek Beśka & Krzysztof Jasiński & Tomasz Rychlik & Marcin Spryszyński, 2012. "Mixed systems with minimal and maximal lifetime variances," Metrika: International Journal for Theoretical and Applied Statistics, Springer, vol. 75(7), pages 877-894, October.
    • Handle: RePEc:spr:metrik:v:75:y:2012:i:7:p:877-894
    DOI: 10.1007/s00184-011-0357-5
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    References listed on IDEAS

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