A manufacturer knows that their items have a normally distributed lifespan, with a mean of 11.7 years, and standard deviation of 3.5 years. If 25 items are picked at random, 8% of the time their mean...

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 11.7 years, and standard deviation of 3.5 years.


If 25 items are picked at random, 8% of the time their mean life will be less than how many years?


Give your answer to one decimal place.