Question

In order to measure the reliability of a high-failure item, 50 units were placed on test. The following failure and censor times (in hours) were recorded: 3, 10, 12, 17, 22, 28+, 30, 32, 32, 45, 53, 59+, 71, 77, 79, 90, 91, 101, 129, 131. The test was terminated by management after 150 hours. Assume a CFR model. (a) Estimate the MTTF from the test data. (b) Based on the estimated MTTF, estimate the number of units to be placed on test if management desires to generate 5 additional failures with 200 hr of additional test time. (c) If the test in (b) is to be terminated after 100 hr, what is the expected number of failures generated without replacement of failed units? With replacement of failed units?

          In order to measure the reliability of a high-failure item, 50 units were placed on test. The following failure and censor times (in hours) were recorded: 3, 10, 12, 17, 22, 28+, 30, 32, 32, 45, 53, 59+, 71, 77, 79, 90, 91, 101, 129, 131. The test was terminated by management after 150 hours. Assume a CFR model.
(a) Estimate the MTTF from the test data.
(b) Based on the estimated MTTF, estimate the number of units to be placed on test if management desires to generate 5 additional failures with 200 hr of additional test time.
(c) If the test in (b) is to be terminated after 100 hr, what is the expected number of failures generated without replacement of failed units? With replacement of failed units?

In order to measure the reliability of a high-failure item, 50 units were placed on test. The following failure and censor times (in hours) were recorded: 3, 10, 12, 17, 22, 28+, 30, 32, 32, 45, 53, 59+, 71, 77, 79, 90, 91, 101, 129, 131. The test was terminated by management after 150 hours. Assume a CFR model.
(a) Estimate the MTTF from the test data.
(b) Based on the estimated MTTF, estimate the number of units to be placed on test if management desires to generate 5 additional failures with 200 hr of additional test time.
(c) If the test in (b) is to be terminated after 100 hr, what is the expected number of failures generated without replacement of failed units? With replacement of failed units?

Added by Alexander G.

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