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Mathematics, 06.01.2021 18:20 keshan3000

A dusk to dawn outdoor lightbulb has an expected (mean) life of 8,000 hours with a standard deviation of 250 hours. How many bulbs in a batch of 500 can be expected to last no longer than 7,500 hours?

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A dusk to dawn outdoor lightbulb has an expected (mean) life of 8,000 hours with a standard deviatio...

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