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OpenStudy (anonymous):
PLEASE HELP MEDALLLLSSS!! The life expectancy of a typical lightbulb is normally distributed with a mean of 2,000 hours and a standard deviation of 27 hours. What is the probability that a lightbulb will last between 1,975 and 2,050 hours? 0.17619 0.32381 0.79165 0.96784
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