Question: 1 . An experiment is conducted to test the reliability of Unit A . Totally 5 identical Unit A s are used and the total

1. An experiment is conducted to test the reliability of Unit A. Totally 5 identical Unit As are used and the total testing time is 300 hours. The first failed item breaks down after 70 hours; the second failure happens after 89 hours; and the third and final failure happens after 210 hours. The remaining two items have not failed. Please estimate the MTBF for Unit A.

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