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Suppose that the lifetimes of TV tubes arenormally distributedwith astandard deviationof1.1 years. Suppose also that exactly30 % of the tubes die before5 years. Find themeanlifetime

Suppose that the lifetimes of TV tubes arenormally distributedwith astandard deviationof1.1

years. Suppose also that exactly30

of the tubes die before5

years. Find themeanlifetime 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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