Six units were tested over an 80-hour period. One unit failed after 5 hours and a second unit failed after 60 hours. The remaining four units performed satisfactorily until the end of the test. The failure rate is:

Six units were tested over an 80-hour period. One unit failed after 5 hours and a second unit failed after 60 hours. The remaining four units performed satisfactorily until the end of the test. The failure rate is:

Six units were tested over an 80-hour period. One unit failed after 5 hours and a second unit failed after 60 hours. The remaining four units performed satisfactorily until the end of the test. The failure rate is:



a. 0.0052 units/hour.

b. 0.0250 units/hour

c. 0.0308 units/hour.

d. 0.1354 units/hour.



Answer: a. 0.0052 units/hour.


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