Mathematics, 13.11.2019 17:31 guazet7650

The lighting department of a city has installed 2000 electric lamps with an average life of 1000 hrs and a standard deviation of 200 hrs. (10 points) a. after what period of lighting hours would we expect 10% of the lamps to fail? b. how many lamps may be expected to fail between 900 and 1300 hrs?

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