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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 4.8 years, and standard deviation of 1.3 years. If you

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 4.8 years, and standard deviation of 1.3 years. If you randomly purchase 17 items, what is the probability that their mean life will be longer than 4 years? (Round answer to four decimal places)

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