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OpenStudy (anonymous):
Please Help ! The lifetime of a 2-volt non-rechargeable battery in constant use has a normal distribution with a mean of 516 hours and a standard deviation of 20 hours. Ninety percent of all batteries have a lifetime less than? Thank you.
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OpenStudy (anonymous):
okay i believe we can simply use the empirical graph right?
OpenStudy (anonymous):
i dont know?
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