A household is advertised as having more than 10-yr life if, Ask an Expert

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A household is advertised as having more than 10-yr life. If the following is PDF, determine its reliability for the next 10 yrs if it survived a 1-yr warranty period:

f(t) = 0.1(1 + 0.05t)^-3 t>=0

a) What is its MTTF before waranty?

b) what is MTTF after the warranty period assuming it survived?

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