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In the paper we consider the problem of the evaluation of systems reliability using statistical data coming from the reliability tests of its elements when the life times of the elements are described by the exponential distribution. We assume that these lifetime data may be reported imprecisely, and that this lack of precision may be described by fuzzy sets. As the direct application of the fuzzy sets methodology leads, in the considered case, to very complicated and time consuming calculations, we propose simple approximations of fuzzy numbers by the shadowed sets introduced by Pedrycz (1998). The proposed methodology may be simply extended to the case of general lifetime probability distributions.
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Operational Program Digital Poland, 2014-2020, Measure 2.3: Digital accessibility and usefulness of public sector information; funds from the European Regional Development Fund and national co-financing from the state budget.
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