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The rated life of lamps is based on the time elapsed when only _____ percent of...

The rated life of lamps is based on the time elapsed when only _____ percent of a group of lamps still remain burning. Select one:

a. 80%

b. 50%

c. 60%

d. 100%

e. 75%

engineering   Electrical-Engineering   
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Answer #1

Answer: ② 50f. Eaplenarion consider 10 light bulbs are tested and found to have can Average Raped life of 1000 hour. This mea

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