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An equipment manufacturer subjected 100 machines to 6480 hours of testing (all running simultaneously). Four of them failed after: 1430 hrs 2915 hrs 3704 hrs

An equipment manufacturer subjected 100 machines to 6480 hours of testing (all running simultaneously). Four of them failed after: 1430 hrs 2915 hrs 3704 hrs and 4703 hrs of operation respectively. What is the mean time between failures (MTBF) of these types of machines (calculate to 1-decimal place like 12345.6 hours).

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