Question: 20 air conditioning systems designed for use by astronauts in NASA space shuttles were operated for 1,200 hours at NASA's Huntsville, Alabama test facility. Four

20 air conditioning systems designed for use by

astronauts in NASA space shuttles were operated for 1,200 hours at NASA's Huntsville, Alabama test facility.

Four of the systems failed during the test:

-one after 400 hours

-the second after 800 hours

-the third after 500 hours

-the fourth one after 900 hours

Calculate the Mean Time Between Failures

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