The operating time of a system is 24 hours per day, Monday through Saturday.
Failure of the system occurs as follows.
Monday: No failure
Tuesday: 5 A. M. to 7 A. M. Wednesday: No failure
Thursday: 4 P.M. to 8 P.M.
Friday: 8 A. M. to 11 A. M. Saturday: No failure
What is the MTBF of the system?
A. 3 hours
B. 8 hours
C. 45 hours
D. 56 hours
Answer: A
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