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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.6...

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.6 years, and standard deviation of 2.1 years.

If 11 items are picked at random, 6% of the time their mean life will be less than how many years?

Give your answer to one decimal place.

Math   Statistics-And-Probability   
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