A dusk-to-dawn outdoor lightbulb has an expected mean life


Question: 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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Mathematics: A dusk-to-dawn outdoor lightbulb has an expected mean life
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