25. On a final exam in Dr. Mean's course (some say Dr. Mean is not nice and others say he is just average), the grades are normally distributed with a mean of 77 and a standard deviation of 12.

a) Find the probability that a randomly selected student makes an F on the final exam (Less than 65).

b) Using the Central Limit Theorem, find the probability that a class of 30 make an F AVERAGE (Less than 65).

c) Interpret the results.