The percent of fat calories that a person in a city consumes daily is normally distributed with a mean of about 36 and a standard deviation of 10. Suppose that 16 individuals are randomly chosen. Find...

The percent of fat calories that a person in a city consumes daily is normally distributed with a mean of about 36 and a standard deviation of 10. Suppose that 16 individuals are randomly chosen. Find the probability that the average percent of fat calories consumed in this group of 16 is less than 40.