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A new type of LED lightbulb goes out (lamp life) after a normally distributed number of hours, with a mean of 33,000 hours and a

A new type of LED lightbulb goes out (lamp life) after a normally distributed number of hours, with a mean of 33,000 hours and a standard deviation of 5,000 hours. Using the NORM.DIST function in Excel, what proportion of lightbulbs will go out before 30,000 hours?

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