Question: Two hundred (200) devices are put on life test without replacement and the times to failure of the first ten (10) which fail are:

Two hundred (200) devices are put on life test without replacement and

Two hundred (200) devices are put on life test without replacement and the times to failure of the first ten (10) which fail are: 0.7, 1.4, 1.9, 3.0, 5.5, 8.0, 17.5, 26.0, 44.0 and 80.0 hours: a) Assuming a Weibull failure-time distribution, estimate the parameters a and as well as the failure rate at 100 hours. b) How does the value of a compare with the value we would obtain if an exponential model is assumed?

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