The lifetime of lightbulbs that are advertised to last for 5100 hours are normally distributed with a mean of 5400 hours

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answerhappygod
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The lifetime of lightbulbs that are advertised to last for 5100 hours are normally distributed with a mean of 5400 hours

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The lifetime of lightbulbs that are advertised to last for 5100 hours are normally distributed with a mean of 5400 hours and a standard deviation of 150 hours. What is the probability that a bulb lasts longer than the advertised figure?
Probability =
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