The percent of fat calories that a person consumes each day is normally distributed with a mean of about 33 and a standard deviation of about ten. Suppose that 25 individuals are randomly chosen. Let X = average percent of fat calories. a. For the group of 25, find the probability that the average percent of fat calories consumed is more than seven. (Round your answer to four decimal places.)
b. Find the first quartile for the average percent of fat calories.