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2. Assume streetlights used in the residential areas have a mean life of 550 days with a standard deviation of 75 days. If streetlight lifetimes

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2. Assume streetlights used in the residential areas have a mean life of 550 days with a standard deviation of 75 days. If streetlight lifetimes are normally distributed what percentage of the lamps: a) Last longer than 625 days? b) Last between 400 and 625 days? (Sketch diagram for this case)

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