# MTBF (Mean Time Between Failures) - Seeking help

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#### Mike Taylor

MTBF help

Thank you for the help in advance. I'm trying to figure out how the following equation is calculated. Say, a transformer states that it is expected to last at least 100 hours. Suppose this transformer life follows a negative exponential distribution and this expectation has established with a reliability of about .67. What must the MTBF be for this type of transformer?

Thank you
Mike T.

M

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