Question
Asked Nov 26, 2019
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A lightbulb is advertised as lasting 1000 hours with a standard deviation of 150 hours. Assume the life of the lightbulb is normally distributed.

what percentage of the lightbulbs will last less than 1250 hours 

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It is given that the mean and standard deviation are 1,000 and 150, respectively.

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Advanced Topics in Statistics

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