Question: You are evaluating a drive mechanism for an elevator door. It is imperative that the door functions reliably. The failure is modeled with an exponential

You are evaluating a drive mechanism for an elevator door. It is imperative that the door functions reliably. The failure is modeled with an exponential distribution. If the failures per day

(

lambda

)

0.000012 ({1.2}^{* *} 10^{- 5}),

how many days before

1 %

of these drive mechanisms have failed?

You are evaluating a drive mechanism for an elevator door. It

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