Eight low watt bulbs are tested for 600 hours each. One failed at 80 hours and a second failed at 510 hours; all others completed the test. Calculate FR(%), FR(N) and MTBF.

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The Answer of Eight low watt bulbs are tested for 600 hours each. One failed at 80 hours and a second failed at 510 hours; all others completed the test. Calculate FR(%), FR(N) and MTBF.

Eight Low Watt Bulbs Are Tested for 600 Hours Each