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OpenStudy (anonymous):
The life expectancy of a typical lightbulb is normally distributed with a mean of 4,000 hours and a standard deviation of 42 hours. What is the probability that a lightbulb will last between 3,875 and 4,055 hours?
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OpenStudy (mallorysipp234):
@thomaster @agent0smith
OpenStudy (mallorysipp234):
@wolf1728
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