he local authorities in a certain city instal 10,000 electric lamps in the treets of the city. If these lamps have an average life of 1,000 burning ours with a standard deviation of 200 h, how many lamps might be xpected to fail (i) in the first 800 burning hours? (ii) between 800 and 200 burning hours? After how many burning hours would you expect ii) 10% of the lamps to fail? (iv) 10% of the lamps to be still burning? Assume that the life of lamps is normally distributed.

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