Question

30 heating units designed for use in NASA space shuttles normally operate for 1500 hours each....

30 heating units designed for use in NASA space shuttles normally operate for 1500 hours each. Three units failed a trip. The first one failed after 400 hours. The second one failed after 500 hours. The third one failed after 850 hours. What is the MTBF?
Math   Statistics-And-Probability   
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Answer #1

Mean Time Between Failures (MTBF) is given by:

= T/R,

where

T = Total time = (27 X 1500) + 400 + 500 + 850

                       = 42250

N =Number of failures = 3

Substituting, we get:
= 42250/3

         = 14083.3333

So,

Answer is:

14083.3333

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