Historically, final exam scores in regular session Psychology 281 have been normally distributed with a mean of 72%. 95% of all students obtain scores between 52 and 92.

What percentage of the students obtain scores between 80 and 86? [13.24%]

If a random sample of 45 Psych 281 students was selected at random, what is the probability that the sample's mean final exam score would be greater than 68? [0.9957]