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40 circuit boards are put on test and the test is ended at 200 hours. Circuit...

40 circuit boards are put on test and the test is ended at 200 hours. Circuit boards that fail are not replaced. At 200 hours, 21 boards have failed. The sum of the fully observed lifetimes is 2,670 hours. Compute the maximum-likelihood estimator of the mean lifetime, assuming that the lifetime for this type of item has an exponential distribution. State your answer rounded to the nearest whole hour.

math   Statistics-And-Probability   
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