A control system working under unknown random actions is called
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Stochastic control system
Stochastic control is a subfield of control theory that deals with the existence of uncertainty either in observation or in the noise that drives the evolution of the system. Methods of stochastic control based on the parametrization of distributions allow the design of practical software tools. A control system is the system which is having feedback and can be both positive and negative and working under unknown random actions is called stochastic control system.