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a manufacturer knows that their items have a normally distributed lifespan, with a mean of 11.7...

a manufacturer knows that their items have a normally distributed lifespan, with a mean of 11.7 years, and standard deviation of 0.7 years. if 6 items are picked at random, 10% of the time their mean life will be less than how many years?
Math   Statistics-And-Probability   
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