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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 9.4...

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 9.4 years, and standard deviation of 2.6 years.

Round your answer to four decimals.

If you randomly purchase 25 items, what is the probability that their mean life will be longer than 9 years?

Math   Statistics-And-Probability   
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