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Suppose that the lifetimes of TV tubes are normally distributed with a standard deviation of1.2 years. Suppose also that exactly25% of the tubes die before5years.

Suppose that the lifetimes of TV tubes are normally distributed with a standard deviation of1.2 years. Suppose also that exactly25% of the tubes die before5years. 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.

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