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compute the mean time between failure (MTFB)

The following historical time between failure and repair time for a certain punch press is available. The machine was installed in the month of June after an appropriate burn-in period. The first breakdown happened on August 5, after 221 hours of use.

(see chart in attached file)

Date 8/5 11/6 12/19 2/7 3/30
# of hrs of use before breakdown 221 335 190 250 284
# of hours spent on repair 12 18 16 10 14

a. compute the mean time between failure (MTFB)
b. Compute the mean time to repair (MTTR)
c. Compute the availability of the machine

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Solution Summary

Discussion and computation.