This paper presents one method for probability estimation of some property of imperfect
system (stability, oscillations appearance, controllability, reliability, observability, etc.). That
is significant improvement compared to papers where considered property is always
stability. All real technical systems are imperfect and they have stochastic parameters.
Normal distribution is the most frequent distribution and the method described in this paper
is applied to this distribution. The region of certain system property is approximated in …