What is the maximum allowable value for s if the life x of


Suppose that the life in hours of a electronic tube manufactured by a certain process is normally distributed with parameters m = 160 hours and σ. What is the maximum allowable value for σ, if the life X of a tube is to have probability 0.80 of being between 120 and 200 hours?

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Basic Statistics: What is the maximum allowable value for s if the life x of
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