Question: e. During useful life (random failure) reliability at mean time to failure (MTTF) is 0.368, during wear out part of the life studied using Weibull

e. During useful life (random failure) reliability at mean time to failure (MTTF) is 0.368, during wear out part of the life studied using Weibull model, when would one observes same reliability (0.368)? Solution: At t=9

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