A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.6 years, and standard deviation of 2.5 years. If 3 items are picked at random, 10% of the time their mean...

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.6 years, and standard deviation of 2.5 years.


If 3 items are picked at random, 10% of the time their mean life will be less than how many years?


Give your answer to one decimal place.