The mean time between failures is found to be 322.4 hours, Ask an Expert

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an electronics company manufactures radios and conducts extensive tests on 80 radios randomly selected models of a type used in airplanes. the mean time between failures is found to be 322.4 hours for a sample group. assuming that s= 45.0 hours, find the 99% confidence interval for the mean time between failures for all such radios.

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