The time to failure in operating hours of a critical solid-state power unit has thehazardratefunction lambda(t)=0.003 (t/225)^0.5 , for t ? 0

[IstherandomvariableIFR, CFR, or DFR?]

(a) What is the reliability if the power unit must operate continuously for 20hours?

(b) Determine the design life if a reliability of 0.90 is desired.

Question 2) The time to failure in operating hours of a critical solidstate power unit has 0.5 the hazard ra'le function 1(0) = 0.003 (i) ,for r 2 0 [Is the random variable IFPH 225 CFR, or DFR?] (a) What is the reliability if the power unit must operate continuously for 20 hours? (b) Determine the design life if a reliability of 0.90 is desired. (c) Given that the power unit is mctional after the rst 20 hours, what is the new design life (starting 'om hour 20) for this system if the reliability of 0-9 is desired