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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 13 years, and standard deviation of 0.9 years. The 10%
A manufacturer knows that their items have a normally distributed lifespan, with a mean of 13 years, and standard deviation of 0.9 years. The 10% of items with the shortest lifespan will last less than how many years? Give your answer to one decimal place.
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