After how many hours should all of the bulbs be replaced


Assume that the lifetime of a bulb is normally distributed, with a mean of 3000 hours and a standard deviation of 200 hours. If the department wants no more than 1% of the bulbs to burn out before they are replaced, after how many hours should all of the bulbs be replaced?

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Basic Statistics: After how many hours should all of the bulbs be replaced
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