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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.4 years, and standard deviation of 1.8 years. If you

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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.4 years, and standard deviation of 1.8 years. If you randomly purchase 23 items, what is the probability that their mean life will be longer than 7 years

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