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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?
OpenStudy (anonymous):
a: 0.8835 b. 0.7825 c. 0.9133 d .0.9035
OpenStudy (anonymous):
HELP PLEASE
OpenStudy (anonymous):
D
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how did you get that?
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OpenStudy (anonymous):
thank you
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