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OpenStudy (anonymous):
a company that makes light bulbs claims that its light bulbs have an averagelife of 750 hours with standard deviation of 20 hours. a random sample of 64 light bulbs istaken, let x bar be the mean life ofthis sample.
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OpenStudy (anonymous):
what is the prob that x bar>or equal to 750 what ist he prob that 745<orequal to xbar<equal to 755
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