هنا التواصل طلاب ماجستير الاحصاء

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الاخ "علم الاحصاء " عندي سؤال هل ممكن تساعدني في سؤال احصائي
a system is composd of five independent component connected in series
a.if the PDF of he time to failure of each component is exponential with scale parameter theta then give the PDF of time to failure of the system
b.repeat (a) , but assume that the components are connected in parallel.
c.suppose that the five component system fails when at least three components fail .give the PDF of the time to failur of the system
d.suppose that in independent components are not distributed identically but rather
x(1)= exp (theta 1) give the PDF OF TIME to failure of a series system in this case

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