The lighting department of a city has installed 2000, Basic Computer Science

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The lighting department of a city has installed 2000

The lighting department of a city has installed 2000 electric lamps with an average life of 10,000 h and a standard deviation of 500 h.

(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 7000 and 10,000 h?

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Basic Computer Science: The lighting department of a city has installed 2000

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