n(Totalmachine1)=287+123
n(Unsatisfactorymachine1)=123
P(Unsatisfactorymachine1)=n(Totalmachine1)n(Unsatisfactorymachine1)
P(Unsatisfactorymachine1)=410123=0.3
n(Totalmachine2)=240+60=300
n(Satisfactorymachine1)=240
P(Satisfactorymachine2)=n(Totalmachine2)n(Satisfactorymachine2)
P(Satisfactorymachine2)=300240=0.8
P(Unsatisfactorymachine1∩Unsatisfactorymachine2)=
P(Unsatisfactorymachine1)⋅P(Unsatisfactorymachine2)
=0.3×0.8=0.24
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