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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 14.8 years, and standard deviation of 3.9 years. If 4

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 14.8 years, and standard deviation of 3.9 years. If 4 items are picked at random, 9% of the time their mean life will be less than how many years? Give your answer to one decimal place.

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