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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 10.7...

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 10.7 years, and standard deviation of 2.8 years.

If you randomly purchase 25 items, what is the probability that their mean life will be longer than 12 years?

Math   Statistics-And-Probability   
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