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Suppose that the lifetimes of old fashioned TV tubes are normally distributed with a standard deviation of 1 2 years Suppose also that exactly 20

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Suppose that the lifetimes of old fashioned TV tubes are normally distributed with a standard deviation of 1 2 years Suppose also that exactly 20 of the TV tubes die before 5 years Find the mean lifetime of TV tubes Carry your intermediate computations to at least four decimal places Round your answer to at least one decimal place years X

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