Americans on average drink 78 gallons of coffee individually each year, with a standard deviation of 13 gallons. Assume the population of amounts of coffee drank by Americans individually is normally...

Americans on average drink 78 gallons of coffee individually each year, with a standard deviation of 13 gallons.  Assume the population of amounts of coffee drank by Americans individually is normally distributed.

If a sample of 15 Americans is taken, what is the probability that the sample mean amount of coffee drank individually will be more than 80 gallons?

? ( x̅ > 80 ??????? )

Round your final answer to
four decimal places.

      = ______________