QUESTION 13 The failure time of a component is believed to be an Exponential random variable. A component life test is performed, with the goal being to make inferences about the mean time to failure. One component is in operation at all times; in the event of failure, the failed component is immediately replaced by a new component. Observation begins at time T = 0 and ends at time T = 1,740 minutes, during which time 19 failures occur. Which is the correct limits of a 98% (two-sided) confidence interval for MTTF (in minutes). O Lower limit = 52.24 Upper limit = 159.21 Lower limit = 52.64 Upper limit = 159.01 O Lower limit = 54.64 Upper limit = 157.01 O Lower limit = 52.64 Upper limit =157.01

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