The times in hours that a conveyor belt operates before a mechanical malfunction occurs are given in

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The times in hours that a conveyor belt operates before a mechanical malfunction occurs are given in DS 17.4.1.
(a) If the failure limes are modeled with an exponential distribution, construct a 95% confidence interval for the mean time to failure.
(b) Do you think that it is plausible that the mean time to failure is one week?
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