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OpenStudy (anonymous):
The life expectancy of a typical lightbulb is normally distributed with a mean of 1,975 hours and a standard deviation of 25 hours. What is the probability that a lightbulb will last between 1,950 and 2,050 hours? 0.84 0.77 0.82 0.89
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OpenStudy (anonymous):
@kirbykirby and the question asking begins lol
OpenStudy (amistre64):
do you have a way to determine z scores?
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